Malicious PDF — malware analysis report

Static analysis result for SHA-256 e536d900cffe3fa5…

MALICIOUS

PDF

31.1 KB Created: 2021-07-21 01:21:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 57064eb013e33db5fe1afa423e064de7 SHA-1: 63dcce26758c56c22cd8858bb4e6d794e4a6d9a4 SHA-256: e536d900cffe3fa538c08b3fae59be1603ccbfff145fb875f7d8b8a4911a81f6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a lure for free game coins, directing users to a malicious URL. This URL is flagged as a known malicious redirector, indicating a phishing or scam attempt. The document body and embedded artifacts suggest a social engineering tactic to trick users into visiting a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier clean score 0.0564

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-coin-master-2021-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_off00002242.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2242 23764 bytes
SHA-256: 58021f7da2fbcd74fdd23980354506ebd76134b6e4a6c8f5585c9e53e58812db
font_01_sfnt_off0000586b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x586B 18112 bytes
SHA-256: 0727bd4027d3f5eec951b181c2bc31ee4d98e10eed2c862aff41d240a04f60ea

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