Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a4af1cecb5a494…

MALICIOUS

PDF

41.4 KB Created: 2021-05-22 05:14:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8815b6428abdadd6d59061aa227911f1 SHA-1: e1dadc8e81ad431532f3ad203f2cdc7b65d80146 SHA-256: a4a4af1cecb5a494aedde2eb88dd7fbe68134fdc64002abcf6b241eabe9bdf92
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 users into interacting with the document. It also embeds multiple URLs pointing to what appear to be fake generators or hacks, including one directly in the document body. The ML classifier also flagged this PDF as malicious, suggesting it likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7471

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-verification-no-download-game-hack
    • http://kukuck.de/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://kukuck.de/images/coin-master-hack_GM406889139.pdf
    • http://kukuck.de/images/minecraft-pvp-hacks_GM479516143.pdf
    • http://kukuck.de/images/robux-website_GM431946152.pdf
    • http://kukuck.de/images/pokemon-go-free-7k-eggs_GM1094591345.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003527.bin
143f6eeb71f56e9f2065869c1cadfe248d9bd777a69b6096e644d306a4d275ae		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3527 26088 bytes
font_01_sfnt_off000070f4.bin
608f0dd4f6bfb6adbccec84228618ee8e4c9e09226d7330efb5300e499d1567f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 3608 bytes
font_02_sfnt_off00007d7c.bin
529ad809d39cb86513f1fd0a7c59ac13158e8644a31ce1f1c8620f9d5ad40971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7C 19180 bytes

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