Malicious PDF — malware analysis report

Static analysis result for SHA-256 576f3c47c9398c1b…

MALICIOUS

PDF

37.5 KB Created: 2021-05-22 16:45:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 65bda606dba78eafdb9435bc74c6912f SHA-1: 6b6d218a7a531f0eb4ec8c64efc911401cde9f4f SHA-256: 576f3c47c9398c1b8fdc7068a0b0749ee083bfd689db97f6ddddba36b376613f
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, designed to trick the user into interacting with a malicious link. The embedded URI points to a URL that likely hosts a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

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/406889139/free-coins-for-coin-master-game-hack
    • http://neltalen.nl/images/how-to-hack-robux_GM431946152.pdf
    • http://neltalen.nl/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdf
    • http://neltalen.nl/images/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • http://neltalen.nl/images/coin-master-free-spin-link-app_GM406889139.pdf
    • http://neltalen.nl/images/free-robux-link_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000359d.bin
45ed819fe706d51fc2705fc45b699912fad7f6c580538351771ae38cb7174111		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x359D 25288 bytes
font_01_sfnt_off00006f3d.bin
7a088efb39c593fb9e3430e15b6f068c1527bd1da3d83cd855e0253773edb83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3D 19040 bytes

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