Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1dbca386c27f15…

MALICIOUS

PDF

29.5 KB Created: 2021-07-20 16:11:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ab8cabc43db40130b67c57505fc5fca1 SHA-1: 90c28573afaa111283b59b8f270b13723322b862 SHA-256: bb1dbca386c27f153327b68623718a2ec1eaf0e0e31e279d8c025d37e2ce9d1e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to a malicious URL. The document body also contains text related to 'Coin Master Free Spins 2021' and a call to action to access a generator, reinforcing the lure. The embedded URL is the primary indicator of malicious activity, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0556

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-free-spins-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_off0000204e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x204E 22224 bytes
SHA-256: fd89729d89147a6ced68152a5e818000bf79591984d71b4fd0e16bef1bc21e92
font_01_sfnt_off000051ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51AC 18288 bytes
SHA-256: 9f7609fba99e53c6baa99bb04d1c7e3f9b7167131c1520eb2a413cdab4a14871

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