Malicious PDF — malware analysis report

Static analysis result for SHA-256 40015f56a1390fba…

MALICIOUS

PDF

37.7 KB Created: 2021-05-21 03:10:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1ee620e42acd6fe527a3c01a2aecab5f SHA-1: a78d705cadf23c6d137f0e17ab3188645e178bdb SHA-256: 40015f56a1390fba467f9606fa1fd6facf23ae3397f2654ccc6833f156f284b8
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA, a common social engineering tactic to trick users into interacting with malicious content. It contains multiple embedded URLs, one of which is directly linked to a fake CAPTCHA lure. The ML classifier also flagged this PDF as malicious. The document's content and structure suggest it is designed to exploit user interaction to download further malicious content.

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-spins-on-coin-master-game-game-hack
    • http://mycookingpot.com/images/coin-master-card-collection-hack-apk_GM406889139.pdf
    • http://mycookingpot.com/images/how-can-you-get-free-robux_GM431946152.pdf
    • http://mycookingpot.com/images/hack-coin-master-app_GM406889139.pdf
    • http://mycookingpot.com/images/aimbot-download-roblox_GM431946152.pdf
    • http://mycookingpot.com/images/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000333e.bin
0f727a675293f49d1e1fc54888bed93f8aae7686f60bb8f3a5060cd27774506d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x333E 29156 bytes
font_01_sfnt_off00007289.bin
b1f30c98449655e0c119849c00bf29bb9bd656252beb56b2567f3adea4b6d957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7289 18148 bytes

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