Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51afba6d2c69f71…

MALICIOUS

PDF

36.1 KB Created: 2021-05-25 10:01:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 90648610451e802428a53d2555ed2510 SHA-1: 5c54db643c1a019efd341154e0c0f472099334a1 SHA-256: f51afba6d2c69f711e41acad3ae31ef05e847fad794dfdeedb6c199710ca0746
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirector infrastructure, specifically promoting 'Coin Master' game hacks. The document body and heuristics indicate a lure to a website that likely hosts further malicious content or exploits. No scripts were extracted, but the embedded URLs and redirector heuristics strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/coin-master-free-daily-spins-link-game-hack In PDF document text
    • https://www.yewtreealpacas.co.uk/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://www.yewtreealpacas.co.uk/images/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://www.yewtreealpacas.co.uk/images/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yewtreealpacas.co.uk/images/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • https://www.yewtreealpacas.co.uk/images/how-to-use-redstone_GM479516143.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
stream_002_off0000330f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x330F 24560 bytes
SHA-256: d13c2708f63f80b261908fe5c696a2c28d1f71dfcc79e45cc2458a5ca81fc6b6
font_01_sfnt_off00006b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B51 18476 bytes
SHA-256: 219409e4a96e727ac7d03afbf10b928993c8ec078f24206d8d8724722cb954a1

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