Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c181d55885c847…

MALICIOUS

PDF

26.6 KB Created: 2021-07-06 00:52:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 99953b1db4a26760c19380f6fca124cb SHA-1: d8e3a016681f63f03d9ce085fcd59c17651e5b46 SHA-256: c0c181d55885c84712de78a3ae11d2d190ba07641d7e9be02486131bcbb1435e
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/free-coins-for-flip-master-game-hack, is identified as malicious infrastructure. The document body also contains this URL and a call-to-action phrase, reinforcing the lure. While no scripts were explicitly extracted, the nature of the redirector suggests it likely leads to a further stage of malicious activity, potentially exploiting a client vulnerability or delivering a payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0372

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/free-coins-for-flip-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
font_00_sfnt_off00001673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1673 21888 bytes
SHA-256: bf6060ce387c99c8b2d5aef0b6f372c6cc0fdd8c75c2682ef69108b7352d36e9
font_01_sfnt_off000046d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46D2 18248 bytes
SHA-256: 15af221dd5c3311a73758cd56b9e13e8fd3ef2e59b1801455b5f1f458413cd9b

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