Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fb4800984ede8a…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 19:51:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b73a8fa37107e0c1193fa6bae78404e2 SHA-1: c8145aeb38ed8fd61571e5b7ad54f95726e7dc19 SHA-256: d3fb4800984ede8afc31233af4897384a4d3052d770c011721cab8c1d7d3c19f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are SEO-optimized and appear to be part of a link farm designed to attract users searching for game cheats and hacks. The primary URL, http://netcdn.tw/app/431946152/ro-ghoul-script-game-hack, suggests the document is a lure for downloading malicious scripts or executables related to games like Roblox. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/ro-ghoul-script-game-hack PDF link annotation
    • http://library.fk.upnvj.ac.id/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-a-free-krambit-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/www-roblox-free-com-generatoryolasite_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-cheats_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-roblox-admin-with-cheat-engine-63_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/blox-fun-info-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/a-hack-to-get-the-bage-admin-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/hack-para-roblox-2021-mayo_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/enter-this-secret-code-for-5m-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-scar-h-free-in-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-skin-strucid-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-hacker-john-20-000-robux-gems-jarvascript-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/afk-hacker-roblox-wds_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_off0000320f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320F 22528 bytes
SHA-256: 2a19b191d772894d4be053f6800237a4c6440184850a6189154c82f2c070d16c
font_01_sfnt_off0000641f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641F 18824 bytes
SHA-256: c7dc71cc212b0e3ecb5550cca84b231a583b24498cd950bd1d4b02a1a2b42142

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