Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b563336319f4a6…

MALICIOUS

PDF

34.9 KB Created: 2021-06-30 00:17:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 01a0b8ec8d2cc5f21f52e066bc9f065c SHA-1: 881bafb10340643189c763bbe4c47ea35aa5d906 SHA-256: b4b563336319f4a696e1e583817a43a3af047892f973da33753447a458b8c94d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites and other PDFs that are themed around game hacks, generators, and cheats, specifically for Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users through search engines. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the links and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure to download potentially malicious content or visit scam websites.

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 http://netcdn.co/app/431946152/how-to-make-a-roblox-thumbnail-for-free-game-hack PDF link annotation
    • http://perpus.fisip.unnur.ac.id/repository/generator-robux-free-download_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/escape-the-supermarket-in-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-redwood-prison-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-hack-roblox-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-roam-open-world-roblox-games_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/cheater-cheater-best-friend-eater-roblox-song-cide_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/prokjs-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/kazuin-how-to-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/cpat-hacker-in-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-kick-someone-on-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-marshmallow-head-in-roblox-2021-for-free_GM431946152.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
font_00_sfnt_off00003076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3076 22128 bytes
SHA-256: 2339b1a773a0f8b068a46c9543b8a127dd453a2bbaa74e801871fe9d6f92d571
font_01_sfnt_off00006161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 19864 bytes
SHA-256: 6cdfe083921aadfba55048b705bca4f2bd33676c24ce9e01fe1afb339fe05c39

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