Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dec050aa81f83bb…

MALICIOUS

PDF

31.2 KB Created: 2021-07-19 09:04:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 31c8dbb731e48ede616a2cc7d8b3941f SHA-1: e7b56dacfd4b0e62c93320c3ff840dbb0eda43ae SHA-256: 2dec050aa81f83bb1468aa18c113399c45f6eee04211722891d1785589208b0d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a fake CAPTCHA lure and a call-to-action button, directing the user to a malicious URL. The document body explicitly mentions 'how-to-get-minecraft-for-free' and includes a link to 'netcdn.tw', which is likely a phishing or malware distribution site. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to trick the user into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9147

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/479516143/how-to-get-minecraft-for-free-on-ipad-game-hack
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-robux-games-that-actually-work_GM431946152.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/minecraft-mobile-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002615.bin
5ff41b48dede5664e8819b135a538427cc0af32a5fb6d04ce8c1afa3c0888fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2615 22728 bytes
font_01_sfnt_off000058af.bin
9e691df568453236f4d0ad162bd2f3ab3ed053816089b7695d089a9ceca8acc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58AF 18224 bytes

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