Malicious PDF — malware analysis report

Static analysis result for SHA-256 99603a86ba8ac05b…

MALICIOUS

PDF

33.6 KB Created: 2021-07-05 05:44:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 78e3e70e32c9feccc70c1d27dc8d901c SHA-1: 6acc97f1a4cf9be61d040f0107f9421499602702 SHA-256: 99603a86ba8ac05bf810ceb07bfa230d72c09a9c855bf53ce4abe4a9a88dfa01
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are presented as download opportunities for game-related cheats or hacks. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links, suggesting a link farm designed to attract users searching for such content. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is intended to distribute malware or lead users to malicious sites.

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/479516143/minecraft-free-computer-game-game-hack
    • http://bentoking.co.uk/media/storage/editor/files/roblox-how-to-get-free-gear-2021_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-hackcome_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-no-password_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/star-wars-lightsaber-roblox-free-level_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/hack-para-restaurant-tycoon-roblox_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-hack-no-verify_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-redeem-code-free_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/roblox-private-server-free-download_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/minecraft-mobile-free_GM479516143.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-no-offers_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/mining-simulator-hack-roblox-android_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/cheats-for-roblox-saiyan-simulator-2_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/robux-generator-no-verification-2021_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-groups-2021_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/cmaster-club-coin-master-hack-tool_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-only-username_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/roblox-cheat-codes-for-pc_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003064.bin
a2fe5d46b857f3a60fac37b62586bf3e0e6107c0066a1688f528fd1609a57738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3064 21716 bytes
font_01_sfnt_off00005fe0.bin
c3858ab9c93ee0d54086a54cbca57519016d4b26ff41f14ee4df921336ab6e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 18576 bytes

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