Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21b1d5d5c6c4eb0…

MALICIOUS

PDF

35.0 KB Created: 2021-05-20 13:01:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4cac4ea42f159bf38f25cf09f201a9bb SHA-1: 75c1fdd6356a7826f376eabe2dcaa6d491b381a0 SHA-256: f21b1d5d5c6c4eb0face1897d6882d0ba9eb7fe688adf59ecc955638ccc35b83
82 Risk Score

Malware Insights

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

The PDF document contains a "Free Robux Scam" lure and displays a fake CAPTCHA, aiming to trick the user into clicking a malicious link. The ML classifier strongly flagged this PDF as malicious. The embedded URLs point to scam-related content, suggesting the document's purpose is to redirect users to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/free-robux-scam-game-hack
    • http://jbm-constructions.com/images/roblox-printables-free_GM431946152.pdf
    • http://jbm-constructions.com/images/coin-master-spins-hack_GM406889139.pdf
    • http://jbm-constructions.com/images/pokemon-go-free-yanma_GM1094591345.pdf
    • http://jbm-constructions.com/images/earn-robux-today_GM431946152.pdf
    • http://jbm-constructions.com/images/free-roblox-script-executor_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f73.bin
45227d3500f06d7a7eac5452b3c72b38fbdb6ae370968b8326a8b896f6a4e005		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F73 24188 bytes
font_01_sfnt_off000066a1.bin
24c52a02bd601b0a5cf869202747d5c16280e540771a7d3b3f68f33a5cbf68e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A1 18500 bytes

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