Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbf5c6f7e0df919…

MALICIOUS

PDF

36.7 KB Created: 2021-05-25 07:37:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f110f308686140dac17c7a3c6df9c947 SHA-1: d6f099ea1b866075618e116087569e0e04d47327 SHA-256: 5bbf5c6f7e0df919683b123af9146295b0957b20efdfcb43a8182cc3ac07b499
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and a prominent 'CLICK HERE TO ACCESS ROBLOX GENERATOR' call to action, which is a common social engineering tactic. It also embeds external URIs pointing to potentially malicious content, suggesting an attempt to trick users into downloading or executing a secondary payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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 https://netcdn.xyz/app/431946152/robux-hack-me-game-hack
    • http://easytransferbrazil.com/images/how-to-hack-coin-master-2021_GM406889139.pdf
    • http://easytransferbrazil.com/images/tiktok-free-50-likes_GM835599320.pdf
    • http://easytransferbrazil.com/images/150-free-spins-coin-master_GM406889139.pdf
    • http://easytransferbrazil.com/images/roblox-hackers-list_GM431946152.pdf
    • http://easytransferbrazil.com/images/real-free-robux-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003316.bin
8f36740dde3342fa718c6ac657fb90a2d5d14583033e357ed1d485e18cd17fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3316 25700 bytes
font_01_sfnt_off00006d8a.bin
63c17dbc7d8c7d1de0ff2471750372836806f4a6a54ec4612fcacbe2caf81c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8A 18444 bytes

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