Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a50ae3d4bef763f…

MALICIOUS

PDF

30.1 KB Created: 2021-07-19 16:32:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ae19a1aebeb1c37225f19e825233e2a1 SHA-1: a2b242b4b9181db0af9b9cc3122840cb9cf7fb9a SHA-256: 6a50ae3d4bef763f8e84e7cbd0a76e13802b09f9a3d7a80436bc22ca870ecd5c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'Coin Master Claim Free Spins' hack. The embedded URL, http://netcdn.tw/app/406889139/coin-master-claim-free-spins-game-hack, is also flagged as malicious. The document body reinforces this lure with text like 'Coin Master Claim Free Spins' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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/coin-master-claim-free-spins-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_off000021fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21FD 22600 bytes
SHA-256: fd2fdc3a525c51674c77b8dfd261ddabfb04aebcfffd2219f96ad9aa3cd2c775
font_01_sfnt_off0000548f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x548F 18220 bytes
SHA-256: 4508a7247666ecd7f475af3e2510e2d7297b60fda6d209b486c2dc6be28a63e8