Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14bb354ac9a917e…

MALICIOUS

PDF

30.6 KB Created: 2021-07-20 10:00:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 73a899c26dd3a44333aeb1142f4794e1 SHA-1: 99a98e74456b1fad3af0e00d2e0dc8beb41fbe08 SHA-256: c14bb354ac9a917e27f6dc2789647f7e2aeb45d97e3c59bd3fddfc0ed18a2d77
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to a 'free generator' for a game, masquerading as a lure for free spins. The document body explicitly mentions 'Get Free Spins Coin Master' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the phishing pretext. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9319

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/get-free-spins-coin-master-game-hack In PDF document text
    • https://dermatologos-thessaloniki.gr/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://dermatologos-thessaloniki.gr/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://dermatologos-thessaloniki.gr/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://dermatologos-thessaloniki.gr/images/free-robux-games-that-actually-work_GM431946152.pdfIn 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_off00002311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2311 23084 bytes
SHA-256: 089f760bcf11bbb3108d5badfe27540b82957cdad41abf90c0da9c0c8b57323b
font_01_sfnt_off00005702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5702 17884 bytes
SHA-256: b0210710b9f532dde69bab3e54691bd54d84b0d7d990975f20826afd1ba27450

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