Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb8ec06575469f5…

MALICIOUS

PDF

34.2 KB Created: 2021-07-19 13:52:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2a1125e17de457905bdd6dc5829e352d SHA-1: 0942e20abed17aaf34ac137254ec58feeb7c40f8 SHA-256: 5cb8ec06575469f56118175d71a63acea130800ccbd0489ce9815c6cba8039b2
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a "Click here to download" lure, aiming to trick the user into visiting a malicious URL. The primary malicious URL identified is http://netcdn.tw/app/431946152/robux-hacks-2021-game-hack. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to exploit vulnerabilities or deliver a payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://netcdn.tw/app/431946152/robux-hacks-2021-game-hack
    • http://www.bripi.pl/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdf
    • http://www.bripi.pl/images/free-minecraft-java-edition_GM479516143.pdf
    • http://www.bripi.pl/images/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://www.bripi.pl/images/free-robux-offers_GM431946152.pdf
    • http://www.bripi.pl/images/how-to-get-a-free-minecraft-server_GM479516143.pdf
    • http://www.bripi.pl/images/how-to-get-minecraft-for-free-on-pc_GM479516143.pdf
    • http://www.bripi.pl/images/minecraft-bedrock-free-with-java_GM479516143.pdf
    • http://www.bripi.pl/images/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • http://www.bripi.pl/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • http://www.bripi.pl/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f4e.bin
eb919aec4bb148ddbeebf93655f1fd066f05a03f4234aa5bf5038bc02be5705e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4E 22648 bytes
font_01_sfnt_off000061ad.bin
c25860e926ea61b583b1bca699862cfc3d326a91e52da2ecb3910b80af1c4ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AD 18836 bytes

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