Malicious PDF — malware analysis report

Static analysis result for SHA-256 e542fffe5abca293…

MALICIOUS

PDF

34.7 KB Created: 2021-06-28 09:18:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 34d3e3039b93c6ea7de9c1dff3c18a36 SHA-1: 493d5183d0f4d318912e64a41949d878389cf582 SHA-256: e542fffe5abca293191c0993378ba9300fc64664a8af590a8e62323e9d7118c6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm heuristic, suggesting it is designed to redirect users to external sites. The document body and extracted URLs indicate a lure for free in-game items, a common tactic for distributing malware. The ML classifier also flagged this PDF as malicious with high confidence.

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.co/app/431946152/ww-free-robux-com-game-hack
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-accessories-roblox_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/games-that-give-you-free-robux_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/make-your-own-roblox-avatar-for-free_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/can-pokemon-go-free-evolve-after-trade_GM1094591345.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/june-29-coin-master-hack-no-human-verification_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-noclip-in-roblox-cheat-engine-67-2021_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-hack-no-human-verification_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/easy-robux-hack_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/games-that-give-free-robux_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/kick-persons-in-free-draw-2-roblox_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/microsoft-rewards-free-robux_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-coins_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/hack-wekk-roblox_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-hack-simon-says-on-roblox_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ecf.bin
8e67146af1db042a7931e0f7fcd0fb4ec90759af3489488f2e424f50e9e63c70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECF 22684 bytes
font_01_sfnt_off0000619d.bin
a173ff8a3a1fb1a8f757a1ab0f7adc35a375ad8a6d6bf5003b7cfea3ec8bf678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 19336 bytes

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