Malicious PDF — malware analysis report

Static analysis result for SHA-256 28546e69500ec29e…

MALICIOUS

PDF

37.8 KB Created: 2021-05-12 19:35:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2a6cc47f1e42909456d81190e6b36bb9 SHA-1: bc640f6063939bfaf993d5881dc5093a53387414 SHA-256: 28546e69500ec29e33cfb930f1b503552ab9bccb08457606bef0a7166c4b149d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'freerubux-game-hack' infrastructure. The document body also contains text related to 'Freerubux' and a 'CLICK HERE TO ACCESS ROBLOX GENERATOR' call to action, reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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 https://netcdn.xyz/app/431946152/freerubux-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
stream_003_off00003504.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3504 27336 bytes
SHA-256: 3ccb973956e3c96f0cda95d7e640395973b9f10155066c29d8d034532de3e1c5
font_01_sfnt_off000073d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D9 17872 bytes
SHA-256: f4416bbc5f287efcbe31c7b4c704cc92a0ced0ddcdd2f5cfb5fb7d41fdf7fc1a

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