Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ed4b6e8cd492e2…

MALICIOUS

PDF

32.7 KB Created: 2021-07-20 12:50:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dc91a5782f3663c0eec474bc65a59621 SHA-1: 613a3a9e11cde36bcd6de81bc68b69927a60220a SHA-256: 54ed4b6e8cd492e2d066834029eb889bddfb054f97ef3ef64fb290c66c738e78
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document displays a fake CAPTCHA and includes a prominent "CLICK HERE TO ACCESS ROBUX GENERATOR" call to action, directing users to a malicious URL. This strongly suggests a social engineering tactic to trick users into downloading a payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/robux-gift-card-free-game-hack
    • http://www.jetape.com.br/ckfinder/userfiles/files/roblox-free-robux_GM431946152.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/minecraft-for-chromebook-free_GM479516143.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/minecraft-bedrock-free-with-java_GM479516143.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/free-robux-codes-generator_GM431946152.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/free-tiktok-accounts-with-followers_GM835599320.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/real-minecraft-for-free_GM479516143.pdf
    • http://www.jetape.com.br/ckfinder/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002a98.bin
8b0f13a3718fdf85da63c55563b96563711fb0c5036102275e1184344b6941aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A98 22264 bytes
font_01_sfnt_off00005c33.bin
bb6ba787686cb78dc8bffd8aa27003d08d9877f569f527752ba86e56c9229aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C33 18828 bytes

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