Malicious PDF — malware analysis report

Static analysis result for SHA-256 3304141f831c9df1…

MALICIOUS

PDF

40.5 KB Created: 2021-05-22 17:35:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9cd3167f74ed3be930671b264c665b36 SHA-1: 5b145fa770bead8116c36a5be36dc2c75223d057 SHA-256: 3304141f831c9df15d34ff8018dad0c229f4f60311032f4dbb6598f2826a2c29
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It contains multiple embedded URLs, including one that points to a potential download. The ML classifier also flagged this PDF as malicious. The presence of these elements suggests the document is designed to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7768

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/835599320/free-tiktok-likes-without-verification-game-hack
    • http://cepobajodeva.com/images/free-attacks-on-coin-master_GM406889139.pdf
    • http://cepobajodeva.com/images/is-minecraft-java-edition-free_GM479516143.pdf
    • http://cepobajodeva.com/images/how-to-get-free-robux-without-verification_GM431946152.pdf
    • http://cepobajodeva.com/images/coin-master-free-coins-2021_GM406889139.pdf
    • http://cepobajodeva.com/images/how-to-hack-coin-master-facebook_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032a6.bin
24ded1c6217745d392dac7fd3b3ee538cf56766ed5d63e326062309e92965b71		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A6 29508 bytes
font_01_sfnt_off000072fc.bin
5e0712ca08337fb3b2e5736ec787a8b2ab1b9b6f3706f0b029d23afe08e6a7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FC 2892 bytes
font_02_sfnt_off00007ce1.bin
2890867b549cf671f2c98eef92adc8de00a1acce0cbbf08ac1c0ae5a6c34295b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE1 18324 bytes

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