.pdff Ransomware — How to Remove Virus Infections (+ Decrypt Files)

.pdff Ransomware — How to Remove Virus Infections (+ Decrypt Files)

This article will aid you to remove .pdff Ransomware. Follow the ransomware removal instructions provided at the end of the article.

.pdff Ransomware is one that encrypts your data and demands money as a ransom to get it restored. Files will receive the .pdff extension. The .pdff Ransomware will leave ransomware instructions as a desktop wallpaper image. Keep on reading the article and see how you could try to potentially recover some of your locked files and data.

Threat Summary

Namepdff ransomware
TypeRansomware, Cryptovirus
Short DescriptionThe ransomware encrypts files by placing the .pdff before the affected files on your computer system and demands a ransom to be paid to allegedly recover them.
SymptomsThe ransomware will encrypt your files and leave a ransom note with payment instructions.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by pdff ransomware


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss pdff ransomware.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

.pdff Ransomware – Update January 2019

There is a decrypter tool released for STOP ransomware’s .pdff Ransomware variant. The tool was initially released for the .puma, .pumax, .pumas versions of the cryptovirus. Michael Gillespie has updated it to also support .djvu, .djvuq, .djvur, .djvut, .djvuu, .pdff, .tfude, .tfudeq, .tro, .udjvu, .tfudet. You can download the tool via the Decryption Tool link here. The tool requires a pair of an original file and its encrypted version.

.pdff Ransomware – Distribution Techniques

The .pdff virus is a newly found ransomware which has been identified in a small attack campaign. It appears that the captured samples associated with it are testing releases. Due to the fact that the number of deployed viruses is relatively low the analysts cannot determine which would be the main delivery methods when the final version is ready.

One of the main sources of ransomware attacks is the coordination of email phishing SPAM campaigns. They are designed to appear as being sent by legitimate services or companies that the victims know and trust. Most of them even feature hijacked design elements such as images and layouts to make them more believable. The actual .pdff ransomware files are directly attached to the email messages or they can be linked in the body contents. Another method that can be used by the hackers behind the malware is to construct malicious web sites that imitate legitimate and safe portals and download sites, as well as software landing pages.

The .pdff ransomware can also be found across all content found on file-sharing networks like BitTorrent where pirate and legitimate data is distributed.

Victims can get infected by acquiring payload carriers of which there are two main types:

  • Malicious Documents — The hackers behind the .pdff ransomware can produce documents containing the necessary commands with all popular formats: spreadsheets, presentations, text documents and databases. When they are opened by the victim users a notification prompt will be spawned asking them to enable the macros, usually the reasons quoted are to “correctly view the document”.
  • Application Installers — The criminals can take the legitimate setup files of popular applications and modify them with the virus installation code similar to the documents. Usually packages that are chosen include the following: system utilities, creativity suites, productivity applications and office tools, as well as computer games.

Larger infections can be caused by malicious web browser plugins, alternatively known as hijackers. They are mostly found on the relevant repositories with fake developer credentials and user reviews. When they are installed changes to the browser settings will be made as well in order to redirect the victims to a certain hacker-controlled page: the default home page, search engine and new tabs page.

.pdff Ransomware – Detailed Analysis

The security analysis of the .pdff ransomware is not yet available however the preliminary information about it shows that it must be related to the recent .djvu virus releases.

.djvu Files Virus – How to Remove It

As these infections are still in an early release they do not contain any modules besides the encryption component. We expect that future versions of it might base themselves on advanced ransomware and thus have a much larger set of attack capabilities. Some of the essential ones are the following:

  • Data Harvesting — The .pdff ransomware engine can be programmed to scan the memory and hard drive contents for information that may be useful to the attackers. Usually this consists of a report of the installed hardware components, user configuration and Windows registry values. In certain cases they can also be programmed to steal user data that can directly expose the identities of the victims: name, address, phone number, location, interests and even any stored passwords.
  • Security Bypass — The collected information about the compromised computers allows the engine to identify if any security software or services that can interfere with the virus operations is installed. Their real-time engines can be bypassed or completely removed.
  • Process Hookup — Many of the malicious engines can hook up to already running programs and services, this is done in order to acquire information about the users activities.
  • Windows Registry Modifications — The .pdff ransomware may impose Windows Registry modifications both to the operating system and the third-party installed applications. In both cases this can lead to severe performance issues and system stability along with the inability to launch certain tasks or, services or applications.
  • Persistent Installation — The .pdff virus can be installed in such a way that makes recovery very difficult through manipulation of boot options, system configuration files and Windows Registry values. Whenever the computer is started the infection will be triggered. Another factor is that most manual user removal guides will be rendered ineffective as the virus can block access to the relevant recovery menus.
  • Trojan Connection — In certain cases the hackers can embed a Trojan module which is able to establish a secure connection to a hacker-controlled server. It would allow the hackers to overtake control of the infected machines, spy on the victim users and steal user data before it is encrypted.

Many viruses like the .pdff ransomware have the ability to infect the computers with other malware. Possibilities include cryptocurrency miners, hijackers and redirects.

.pdff Ransomware – Encryption Process

The .pdff ransomware encrypts user data with a strong cipher according to a built-in list of target data extensions. In most cases it will target the most popular ones:

  • Archives
  • Backups
  • Documents
  • Images
  • Videos
  • Music

The victim files will be renamed with the .pdff extension and a ransomware note added to coerce the victims into paying a decryption fee to the hackers.

Remove .pdff Ransomwareand Try to Restore Data

If your computer system got infected with the .pdff ransomware virus, you should have a bit of experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect other computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.


Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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  1. Avatarthyago

    Hello, how are you? unfortunately I got this pdff virus
    I’m desperate, help me?

  2. Avatarcipzilder

    i has try stop decrypter tool, but i got log “No key for ID: 4bv7VViMdi9daNlbKoU2ls0g8SnsfMMkXirSdKFr”…please help me…


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