Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb77862a749e51c…

MALICIOUS

PDF

35.2 KB Created: 2021-05-22 02:26:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6bc2a514508ef15956db5f78c405498c SHA-1: ca0a2cbc9279f6db67c23639afefc6096027f336 SHA-256: 4cb77862a749e51c13961bc287347d5b32242ea28f85d522a7e676dbc1ee89db
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into downloading a malicious file disguised as a game hack. It also embeds multiple URLs, including one pointing to a suspicious domain that likely hosts the payload. The document's content and embedded URLs strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/479516143/minecraft-free-app-game-hack
    • http://www.3d-gold.com.hk/upload/files/free-minecraft-server-hosting_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/free-coins-on-coin-master-without-verification_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-coin-spin_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/freespinandcoin_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-robux-without-verify_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003385.bin
2901e151c77b06ef3262880bb89bfe1e337b7d4a87dd26db30f9676fc5cafc4d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3385 24324 bytes
font_01_sfnt_off000069fc.bin
e23e7214a96fe4b3d719dc72cd7ebffceaaf9130bd2cd2fd107204a9a2f0c3c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FC 17744 bytes

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