Malicious PDF — malware analysis report

Static analysis result for SHA-256 478639633c43dfe3…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 12:50:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2804e3a831cea64b8fa51fdadc7c21da SHA-1: 79582bb0c5e26b9b3d9295674f376ff056f689fc SHA-256: 478639633c43dfe37795f93579563feae0453b5ab707df1b2f6d775452ea3242
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are designed as link farms for game hacks and currency generators. The primary lure appears to be related to 'Roblox' and 'Coin Master' cheats. The document's structure and the high number of outbound links suggest a malicious intent to redirect users to potentially harmful sites, possibly for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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.tw/app/431946152/free-roblox-com-game-hack PDF link annotation
    • http://libnh.stikesnh.ac.id/repository/free-robux-hack-on-pc-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-free-star-wars_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/get-free-roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-roblox-games_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_off00003177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3177 22904 bytes
SHA-256: 9afcbe65dd539b3a7b048dc1cab8bed5d12c77350275557e980e94c333a5a10a
font_01_sfnt_off000064bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 18908 bytes
SHA-256: d440ae50c89bf21c2d7cea83ae76656b5c1e07e58309934906c6eda36fd94443

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