Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc1160914172d7d…

MALICIOUS

PDF

43.9 KB Created: 2021-05-21 15:45:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: db12d9224cff11d68e8e90999a39daf1 SHA-1: 71540d7c888348f41921e2be9ff64f61c2439a80 SHA-256: 8bc1160914172d7d8765a40d7cb999eef460d3cf1ba7158670f6e8e8df41c4bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising a "free generator / game hack" for Coin Master. The document body and heuristics confirm the presence of these lures, indicating an attempt to trick users into visiting malicious sites. While no scripts were explicitly extracted, the nature of the links suggests a potential for further payload delivery or phishing. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7947

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 https://netcdn.xyz/app/406889139/free-coins-and-spins-in-coin-master-game-hack In PDF document text
    • http://www.backlineservice.nl/images/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/roblox-person_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33A5 27236 bytes
SHA-256: 2534b5e8d76c6500efe8e06282742f5cb7e505d7983671d325c17a1094d616b8
font_01_sfnt_off00007304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7304 4072 bytes
SHA-256: 4bd8a6a94b85f0995b18fca4131a9a9e00ccdba97b9b1ee7678b97d96e4ad269
font_02_sfnt_off000080ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EA 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00008ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADA 18060 bytes
SHA-256: 1b3bc7270dc207897a9e5e1a55cf6ed9cf064fa4c4c77d14f396411fde3b81d9

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