Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fa6985edd8d6e3…

MALICIOUS

PDF

36.6 KB Created: 2021-05-21 13:36:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9dd7899361b922e78e35c54c53a36086 SHA-1: f689b0e74cffadae93cf6149bf735cee4a405f1e SHA-256: b8fa6985edd8d6e3c2c7791261ca596da099a15108cfd1951d5b61a32c6a090d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body also contains explicit calls to action like 'CLICK HERE TO ACCESS COIN MASTER GENERATOR' and the malicious URL is embedded within the document. This indicates a phishing attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0076

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/406889139/free-spins-coin-master-links-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002cff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CFF 24248 bytes
SHA-256: 881ee3d2c0a1a6bb4c70d2d532cba5a58d5d260a7ed4c683e48ed4b7321cd7f5
font_01_sfnt_off000064a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A1 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00006e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8C 18056 bytes
SHA-256: 07f1a9832fff0ce02b8ea8bcbd6448fb7022c7ac6c85a00fb5b887865844234a

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