Malicious PDF — malware analysis report

Static analysis result for SHA-256 3793ebfdf952bec2…

MALICIOUS

PDF

37.5 KB Created: 2021-05-22 23:05:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 23ecee8cbb2c4586c20bf5d3660fce0e SHA-1: 138c96d05968f2410682a9b33e424af2c42b79d6 SHA-256: 3793ebfdf952bec2cd4b64a72a4fad3c9bb281342370e44dbf9f4ca5c6b3f077
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 the user into clicking a link. The linked URL and other embedded URLs point to resources that likely host malicious content or facilitate further compromise. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/431946152/how-to-hack-someone PDF link annotation
    • http://nsktu.ac.in/ckfinder/userfiles/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/tiktok-free-booster_GM835599320.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/static-moonactive-net_GM406889139.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
font_00_sfnt_off0000338d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x338D 26132 bytes
SHA-256: 62138d94654761801afcc93be99bb85f28cf30f7ce99fa3060c13e021cf8ad2b
font_01_sfnt_off00006f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F27 18912 bytes
SHA-256: 995056b981027bfba3f97be2499ebace8b386febdb07856c531761fbe005e83e

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