Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4bc87d56908108…

MALICIOUS

PDF

39.2 KB Created: 2021-05-06 09:51:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6016b00d7f9ab06f7214d55e59c2e60c SHA-1: 5af327a5eed04240dbfe4563b48de7716f21179c SHA-256: da4bc87d569081088658bf68255d0d2c312be6de017f18c7f3bde785b8e89d8f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a lure for a 'free generator / game hack'. It embeds a URL that points to known malicious redirector infrastructure. The document body text also contains phrases like 'Free Roblox Accounts Nbc' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', reinforcing the lure. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-roblox-accounts-nbc-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_003_off0000341e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x341E 25864 bytes
SHA-256: dc41b8d64c07136ed84faaafb92c14ba77990bcbf33dca98336213eec0a71215
font_01_sfnt_off00006ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE1 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00007892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7892 17916 bytes
SHA-256: 9442fe219235581bbea78716413174df7a3d5640c21bea3cd6eaa7d5b929fc92

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