Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f85698eae82a4f7…

MALICIOUS

PDF

30.7 KB Created: 2021-07-21 00:03:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: be56d82a2df4535800b8d7d9c44f6e09 SHA-1: 87cec6b1fdad71229794581b1cdf3b41d58da5dc SHA-256: 7f85698eae82a4f79b5f5d0be3b24433f7be13928751b271249d4d5321ac5dc8
130 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a "free generator / game hack". The embedded URL, http://netcdn.tw/app/406889139/100-free-spins-coin-master-game-hack, is known to lead to malicious infrastructure. The document body also contains similar text and the call-to-action phrase 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. While no scripts were explicitly extracted, the nature of the PDF and the redirector suggests potential exploitation for client execution, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0486

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 http://netcdn.tw/app/406889139/100-free-spins-coin-master-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_002_off0000237d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x237D 22960 bytes
SHA-256: c400a1559aa9d06695309f0e11f4481de2f70d5a0756a10bd818fe115c1bd3c0
font_01_sfnt_off0000570f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x570F 18164 bytes
SHA-256: 9bc61af2acbda784231945e40c4a4bb5d6810b0d04641be6b37b2cdd3c5b78bc

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