Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a936109e6f5b11…

MALICIOUS

PDF

36.9 KB Created: 2021-05-21 02:51:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8589d58361a6103abcebe87bb67db8db SHA-1: 2f7e0ac053c3059e673c19b5870712d47d4b5475 SHA-256: 53a936109e6f5b11b0a90a5eaf1a141a5867b5abe161000afbc5f5223cb52c65
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, directing users to click on embedded URLs to access a "free Robux generator". The document body and extracted URLs strongly suggest a phishing or scam attempt, likely to lead users to a malicious website or download further malware. No scripts were extracted, but the presence of external URIs and the ML classifier's high confidence indicate malicious intent.

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-do-i-get-free-robux-game-hack
    • http://easytransferbrazil.com/images/microsoft-free-robux_GM431946152.pdf
    • http://easytransferbrazil.com/images/my-robux_GM431946152.pdf
    • http://easytransferbrazil.com/images/code-free-robux_GM431946152.pdf
    • http://easytransferbrazil.com/images/how-to-get-free-robux-fast_GM431946152.pdf
    • http://easytransferbrazil.com/images/free-robux-sites-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003243.bin
890089a6cc7023dad7bad6e0c47e9bb4c96ea82abaa92800b727d961cf6b61b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3243 26748 bytes
font_01_sfnt_off00006e3e.bin
af4dc877dda7dbd9aa71ce66d9a52868b07d358fe63790b9b74aede2acb33558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 18452 bytes

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