Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bf5c0b266a2e25…

MALICIOUS

PDF

36.5 KB Created: 2021-05-10 19:14:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d5e2a5da1e951a0071d927cd73b4edbe SHA-1: bded321b0ca779d7aa657421a8287f57c1910a27 SHA-256: f5bf5c0b266a2e25f5696e6474bcd5ada84cf56f633096ef56f36d16ebebaa9f
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'Coin Master Free Spin and Coins' generator, which is a known tactic for distributing malware or conducting phishing. The document links to a malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coins-fbid-links-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_003_off0000347f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347F 25456 bytes
SHA-256: c36184276565c7e474c741766eb7b3617052712edcc40f54e7eaa75a61ebf96c
font_01_sfnt_off00006d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D06 18388 bytes
SHA-256: 3cac3a67a18aefc9018cab5069c316f318df6e005a7bd0b6256086240f829048

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