Malicious PDF — malware analysis report

Static analysis result for SHA-256 a626b9c682caad86…

MALICIOUS

PDF

36.0 KB Created: 2021-05-10 14:01:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b6c26a2ae32a28827685061fb608f99c SHA-1: 3a153fbe305adf723a298d1ee26761e65393182e SHA-256: a626b9c682caad86f39851e0c055015e76b60b2e9973f38ddce23b17fb1ccede
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a critical heuristic indicating it links to a malicious redirector disguised as a game hack generator. The embedded URL, 'https://netcdn.xyz/app/406889139/hack-coin-master-free-spins-game-hack', is designed to lure users into clicking, likely leading to a second-stage download or exploit. The document body text reinforces this lure with phrases like 'Hack Coin Master Free Spins' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR'.

Machine Learning

  • Nyx PDF Classifier clean score 0.0243

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/hack-coin-master-free-spins-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_off00003433.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3433 24744 bytes
SHA-256: f82ad1cec97682123f14caab6dbba1d2061fe5d8c323685a2de47740476856eb
font_01_sfnt_off00006c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C31 18056 bytes
SHA-256: f90826bfe2bc71c0265d319a9184b169c06436e7d3915f152a6a7ecd0e51099f

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