Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ff435a2e7c5909…

MALICIOUS

PDF

35.1 KB Created: 2021-05-11 20:34:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e0ae018de078af954e66bd8c3bbd8fa5 SHA-1: 056cc33d4940e0733ca8f976ff7da99429a0fc2d SHA-256: f4ff435a2e7c5909f8a212acc3e461782e0e3ac8eb9369e1eee2399ccfd8ccbb
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack lure, linking to known malicious redirector infrastructure. The embedded URL 'https://netcdn.xyz/app/406889139/free-spin-coin-game-hack' is identified as malicious. The document body also contains this URL and a call-to-action phrase, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

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-spin-coin-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_off00003190.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3190 24880 bytes
SHA-256: ba66e1255c3321f90a97df504c28dd2eff396e14099a874258774470c78e3c61
font_01_sfnt_off00006a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3A 17552 bytes
SHA-256: 1253d7eaf8f5164397dbb1e7af89d7368851d27808cb823deec5c99b72de06bf

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