Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c31b2f98591af4…

MALICIOUS

PDF

36.9 KB Created: 2021-05-10 10:45:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aaa02c394b4e17526970963dcd897bc4 SHA-1: 4467a1016e28f6a911effe18064582922168f528 SHA-256: c8c31b2f98591af45a89949f5fea65c38722010e114dc37285e0fa805ea20833
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to a malicious redirector disguised as a game hack generator. The document body reinforces this by displaying 'Coin Master Hack No Download' and a call to action to access the generator. This suggests the primary goal is to trick the user into visiting a malicious URL, likely to download a second-stage payload.

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/406889139/coin-master-hack-no-download-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_off00003636.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3636 24552 bytes
SHA-256: 8a90ca4e6caceb356972266959b8206c1f0c2caf095d8d03e23d62f7d0b00d6e
font_01_sfnt_off00006ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA7 18296 bytes
SHA-256: b5e07150b2161f53c53a5a0ecf5e7f42140b65a1732b8c9e08245fa4e84c8ce4

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