Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d80e5cc0373b5c…

MALICIOUS

PDF

36.7 KB Created: 2021-05-22 07:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 85911d484ece94495fe8b2cb19f118ae SHA-1: 6aca21bedffbcc741e456db4b1660661c7a0dad6 SHA-256: 73d80e5cc0373b5c9e21fd79991e472812e20d031328539f8d934ed6da62e1b3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds multiple URLs, one of which, https://netcdn.xyz/app/431946152/free-roblox-accounts-with-robux-game-hack, is presented as a direct link to a 'free robux' generator, strongly suggesting a phishing or scam attempt. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-roblox-accounts-with-robux-game-hack
    • http://tapinkab.go.id/assets/CKImages/files/hacks-for-coin-master-game_GM406889139.pdf
    • http://tapinkab.go.id/assets/CKImages/files/free-minecraft-texture-packs_GM479516143.pdf
    • http://tapinkab.go.id/assets/CKImages/files/free-robux-with-no-verification-2021_GM431946152.pdf
    • http://tapinkab.go.id/assets/CKImages/files/how-to-get-free-robux-easy_GM431946152.pdf
    • http://tapinkab.go.id/assets/CKImages/files/hack-de-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033c3.bin
75f84beaf405de406b63b8a7772396e92035c86ce7b1aa7f93878d2e3d13fb6a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C3 25140 bytes
font_01_sfnt_off00006ceb.bin
4ebcf990001f3b6d5b8f187221ce9c528a6bcbfca241b55ad06a715c23028265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEB 18676 bytes

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