Ransomware Research

Pdf Ransomware

Pdf is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2023, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Pdf
First Seen
January 1, 2023

How Pdf Ransomware Works

File Encryption Patterns

Pdf modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..pdf

Ransom Note and Payment Demands

After encrypting files, Pdf displays ransom notes demanding payment for file recovery:

fileRETURN FILES.txt

Ransom message:

notes/RETURN FILES.txt

Note locations:

RootDiscsDesktop
fileInfo.hta

Ransom message:

notes/Info.hta

Note locations:

StartUpRoaming

Technical Indicators

Associated Executable Files

The following executable files are associated with Pdf ransomware:

  • Strm
  • Strm.exe

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About This Analysis

This Pdf ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like Pdf.

Last updated: October 30, 2025

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