Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85d3404ed87f21e…

MALICIOUS

PDF

39.6 KB Created: 2021-05-23 21:27:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cf8fc82546e2e9367bdc1c11c354ea94 SHA-1: ecba9138e7df0fd9674c144b92f5aa92d3dbfd3c SHA-256: d85d3404ed87f21eb1120b9cd5e90db880b71eea9d084aa72215d89aa9971aa5
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, as indicated by the SE_FAKE_CAPTCHA heuristic. It also embeds multiple URLs, one of which is directly associated with a fake offer for 'Free Robux'. The ML classifier also flagged this PDF as malicious. These elements suggest the document is designed to trick users into clicking malicious links, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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-no-human-verification-or-survey-or-download-game-hack
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdf
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdf
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/minecraft-java-edition-free_GM479516143.pdf
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/free-roblox-svg_GM431946152.pdf
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdf
    • https://www.bandicam.com
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000357b.bin
39d95dcc3f63cd6548da43f0b13a926a1e2b25408b84855ee939dea284bbec68		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x357B 28092 bytes
font_01_sfnt_off00007579.bin
59e4374f8172b973ba9217c83b5ce6b26483f5ae1ceeffd331798f57e1658bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7579 19736 bytes

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