Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8849e2bb30745fe…

MALICIOUS

PDF

34.9 KB Created: 2021-06-28 06:52:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9a0f599503492b8e9889f6f8a07ae5b0 SHA-1: 88315f091b713c3a0d67b0a1dadf5426c120e339 SHA-256: b8849e2bb30745feb40748c41096eeda96d2dcf0878d5991a91fcb6d482b7629
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document contains a large number of external links, many of which are presented as download links for game cheats or in-game currency. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially unwanted or malicious content suggests a lure for users to download further malware. No scripts were extracted, but the document's structure and content point towards a phishing or malware distribution attempt.

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/roblox-jailbreak-noclip-and-speed-hack-game-hack
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-minecraft-packs_GM479516143.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/stickmasterluke-free-robux-game-link_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-cute-roblox-clothes_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-ios_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-minecraft-mods-for-pc_GM479516143.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/hack-my-spins-coin-master_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/funbloxxyz-free-robux_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/android-oyun-club-roblox-robux-hack_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-studio-free-robux_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-legendary-football-vip-server-free-2021_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-roblox-gear_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/everything-for-free-in-roblox_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/gainblox-gg-robux-free_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/earn-robux-online_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030c1.bin
62e5def0859e99eba414bc1c450e276e6f49c20281d161a23e520b8276628dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x30C1 22504 bytes
font_01_sfnt_off000062c5.bin
9d499863c0730917601615376fcf29e6e766cfe882ea1528e6100d41aca423fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C5 19292 bytes