Malicious PDF — malware analysis report

Static analysis result for SHA-256 6370bf923e030c82…

MALICIOUS

PDF

37.1 KB Created: 2021-05-24 01:40:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fc05a5c0c34d3b469beac9a97aee7721 SHA-1: e80d079648ec56e825d042355f85690571458b89 SHA-256: 6370bf923e030c828a5e23b34e6be34733f04f0b0c3ca07415e148543a29fa50
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick the user into clicking a link that likely leads to malware download. The embedded URLs and document body content, which mentions 'how to hack' and 'free robux', support this phishing and social engineering attack pattern. No scripts were extracted, but the presence of external URLs and the fake CAPTCHA heuristic indicate a malicious intent to deliver a payload.

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-into-someone
    • http://www.sourcology.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/can-i-have-robux_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/coinmaster-spin-ml-free_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/generator-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032e3.bin
253177acfba528f36afb79e83860f74d633dd809319de9c3829f824a0871b781		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E3 26088 bytes
font_01_sfnt_off00006d99.bin
bf4ecd0153dd3a330a8d8544a3db10b129edd23679e66a7dba01ca4f284b0ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D99 18912 bytes

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