Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a3956c56a4d47e…

MALICIOUS

PDF

37.0 KB Created: 2021-05-25 07:31:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 613b9147f78c73ec21cc6155c6342019 SHA-1: 7a0b60610fdd72c9b4a93e4f46b77d683324e1d0 SHA-256: 79a3956c56a4d47e9014a63fd083427d48ae264bae3af0a9dd4664bbd63f47b2
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA, a common lure to trick users into interacting with malicious content. It contains an embedded URI pointing to a URL that promises free Robux, likely a pretext for downloading a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

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/how-to-get-free-robux-on-ipad-game-hack
    • http://vokna.by/images/hack-xp-net-generators-coin-master_GM406889139.pdf
    • http://vokna.by/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://vokna.by/images/official-coin-master-free-spins_GM406889139.pdf
    • http://vokna.by/images/coin-master-free-coins-and-spins-link-2021_GM406889139.pdf
    • http://vokna.by/images/what-do-points-do-in-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000034bb.bin
463334bbd1759aa184e53f82cb651056ee32207e87f613e393f0ced8cd869bc1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34BB 24704 bytes
font_01_sfnt_off00006d8a.bin
df018bfb15659bb80b7243956be10673ebd99e13a4c75edb6b924f306f4c3bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8A 18860 bytes

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