Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77d5847bd9211d6…

MALICIOUS

PDF

43.9 KB Created: 2021-05-15 15:01:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cc267d6e9f781fef1cecafc36f4b2220 SHA-1: 46acb9de55e847b7d31fb67b2cdef88158cf3100 SHA-256: e77d5847bd9211d6c972c4f4420a11906ea68a9912256e220b0df11eba8f4ac1
82 Risk Score

Malware Insights

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

The document employs a fake CAPTCHA lure to entice users into clicking a link, likely to download a secondary payload or visit a malicious website. The embedded URL https://netcdn.xyz/app/431946152/free-robux-by-watching-ads-game-hack is directly referenced in the document body and heuristics, indicating its importance in the attack chain. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.xyz/app/431946152/free-robux-by-watching-ads-game-hack
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-games-to-play-for-free_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-cheat-robux_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-game-hunter_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-golden-card-hack_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-spin-link-of-coin-master_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/best-minecraft-hacks_GM479516143.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/rbxcity-free-robux_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/rbxdemon_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-spin-ml_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/robux-no-human-verification-2021_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/claim-free-robux-button_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/moonactive-coin-master-free-spins_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-robux-generator_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-spin-sites-for-coin-master_GM406889139.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-roblox-premium_GM431946152.pdf
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spin-codes_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b71.bin
0b97650005825726f2416ba8b12b48047a021c0da5df76cc063a8597afd1f504
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B71 25104 bytes
font_01_sfnt_off000085a7.bin
06b7c2c04a08988b26013261e09f65c94c24f523f4ae9df4e6f4943f7c42b6f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x85A7 19472 bytes