Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38d1d96830f9948…

MALICIOUS

PDF

35.6 KB Created: 2021-05-22 09:17:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ee6e22d6ff8483a9741230393dab6828 SHA-1: 3dfc03c06c11e6a20e10e52cea4375d0157479f8 SHA-256: f38d1d96830f994850fc9a4398f1475aa1624834d73a0afdd6438d41b83f87db
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA and includes a call-to-action to trick the user into clicking a link. This link, 'https://netcdn.xyz/app/406889139/how-to-hack-coin-master-game-hack', likely leads to the download of a second-stage payload. Several other PDF URLs were also extracted, suggesting a pattern of distributing malicious documents.

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/406889139/how-to-hack-coin-master-game-hack PDF link annotation
    • http://huananhai.net/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D2 24652 bytes
SHA-256: 48ddd08862aa95908667acb8e77bf44cfbbf952e959a2e7ec08aa2c56f6d4923
font_01_sfnt_off00006b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1A 17880 bytes
SHA-256: 811ddb8557bc0f5be85009fa6d5ae0baa2b7fc09c58d91c5790597872cecd122

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