Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84c0cea2d017fcb…

MALICIOUS

PDF

35.4 KB Created: 2021-06-18 06:27:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 01aa42827dece4995ccc96965fde5640 SHA-1: e00cc712b8e7180b2fe46bf92530e0a78d3284b3 SHA-256: a84c0cea2d017fcb5bfd8997e5741d889800a012d5b55255241d5f5b5cfac2f0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the promise of free game items to direct users to a link farm. The primary URL, http://netcdn.co/app/431946152/how-to-get-free-robux-by-downloading-a-game-game-hack, is part of a larger network of links hosted on lib.icbc-indonesia.org, suggesting a coordinated effort to drive traffic. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains numerous external links, aligning with a link farm or SEO spam tactic.

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-get-free-robux-by-downloading-a-game-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org//repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-maio-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-make-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/como-usar-hack-dillusion-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spins-hack-ios_GM406889139.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_off0000318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318C 22192 bytes
SHA-256: f4555a4d59d7abb3515324123970a1c52385492734d3262d1c5314a2ce7cfbc5
font_01_sfnt_off000062a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A7 19960 bytes
SHA-256: 120ddd310204ea066fe54455c01a0de26a29dbad3d2527d6cf90edf7e8b1dc60

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