Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c6e74900e2e88e…

MALICIOUS

PDF

44.3 KB Created: 2021-05-12 20:55:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 56bb444cb358696dce7b45a7b85e5e66 SHA-1: a659efc3cf4223ee4f6099f988907178a078fb43 SHA-256: c8c6e74900e2e88e4cfcc83665d1f6960dbabcc48a1c997b6daac6e1e031a933
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are disguised as PDF files related to game hacks and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a tactic to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-free-apk-game-hack PDF link annotation
    • http://ikig.ru/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ikig.ru/images/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004995.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4995 30260 bytes
SHA-256: 82d75966da0f9b5089c63a6d0f45bfde3e777249e416a9da2166a261ecb459c7
font_01_sfnt_off00008c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C45 17912 bytes
SHA-256: 5206acb7ea69a133be6841e1064e2d72a54228dc4d5bb59bfc2f267825fea601

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