Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac928d6fbbf57498…

MALICIOUS

PDF

33.2 KB Created: 2021-06-18 00:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 09de5ff3718bfa67c2e08d906573c19f SHA-1: 6c864a9cc54284786f374c44455a7a52e8352271 SHA-256: ac928d6fbbf574982783638fcf5e5220d0430d3c9e231e46362485a7aee93bb7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links designed as lures for game hacks and generators, such as 'free-card-giver-roblox-game-hack'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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/free-card-giver-roblox-game-hack PDF link annotation
    • http://zercalo.org/images/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/get-free-robux-now-easy_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/como-hackear-cuentas-de-roblox-sin-necesidad-de-contrasea_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/money-cheats-for-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-girl_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-download-building_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_off00002c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C0C 22124 bytes
SHA-256: 32556b98c0f7965d49651fc98e7d9ed7b1948dece44f192a57711e62dc5e9597
font_01_sfnt_off00005d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D48 18872 bytes
SHA-256: bb5b0cf3e70fa4631418d4f0e756eb1e5acd373f7456d3faa880933557363c23

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