Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e88c0c98a593060…

MALICIOUS

PDF

42.4 KB Created: 2021-05-12 15:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 541e05c6530f822b86b9cc99afd79993 SHA-1: ab228152c90eaad8f74856a08b84c199dc5b3f6a SHA-256: 4e88c0c98a593060780f9b5887fa91e1b754712129bb53d6fa7d4516a13ebf98
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to a known malicious domain, masquerading as a 'free Robux generator'. The document body and heuristics indicate a lure for game-related cheats, which is a common social engineering tactic. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier clean score 0.0344

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/free-robux-websites-that-actually-work-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_off000038fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38FE 31472 bytes
SHA-256: 4c48e27bd8aa4de07caf338fbd97bb190ced4a4c1b150685ebd7325d540eeab7
font_01_sfnt_off0000822e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822E 19252 bytes
SHA-256: f49525d2cb353299e95430044cca9c62699809686ebb763340304ea0e82a2cbb

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