Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c32c0758f895c0…

MALICIOUS

PDF

42.3 KB Created: 2021-05-10 14:22:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0ae86465f7700d291d51a8891be3249c SHA-1: a6b084d1c2709908e3864e450784286f25ff20b1 SHA-256: 81c32c0758f895c07e9c7dccc8fad93b22f383caf5fa440c1ceca318381eb4b4
82 Risk Score

Malware Insights

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

The document exhibits characteristics of a malicious PDF, including a high ML classifier score and the presence of a fake CAPTCHA lure. It contains numerous embedded URLs, suggesting an attempt to redirect the user to malicious sites for downloading further payloads or engaging in phishing. The primary attack pattern appears to be social engineering via a fake verification prompt to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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/master-coin-hack-mod-game-hack
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-hack-download-ios_GM406889139.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-robux-real-working_GM431946152.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/roblox-help-free-robux_GM431946152.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/how-long-is-the-minecraft-free-trial_GM479516143.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-20-free-spins-link-2021_GM406889139.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-robux-easy-and-fast_GM431946152.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-robux-giveaway_GM431946152.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/google-play-coin-master-free-spins_GM406889139.pdf
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-robux-on-iphone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000457e.bin
44fd4ba484add559304fa0fc0acf00da6840acc8de559eca14eae218e4a2061d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x457E 27144 bytes
font_01_sfnt_off00008473.bin
79663f5c6e364485b04b83db578590d29b6e1ee38eddb5c45b054f63581374ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8473 17888 bytes

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