Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a55a6961a4b15e…

MALICIOUS

PDF

26.8 KB Created: 2021-06-18 16:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8f142911f8e24b5691cc110427310976 SHA-1: eb0d2f2bbb1869d0150dd3bbe32a6b29d5faaaea SHA-256: 91a55a6961a4b15eba62c748ec3a57a52cb7bd16936da343089725e364aa5e89
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free generator / game hack' which redirects to a known malicious URL. The document body text and heuristics indicate a social engineering attempt to trick users into visiting this malicious link. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0521

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.co/app/431946152/how-to-get-a-free-dominus-in-roblox-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1654 20656 bytes
SHA-256: f9b0dad80b13fb0e148c1d7fb799f7cf1591e24c037e792afd8430674349600b
font_01_sfnt_off000042cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42CB 19824 bytes
SHA-256: b7a5c1573eace3f965f8349c42268a078d91b9657f935065bfbcdb61a494e379

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