Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5299d1bff2ddf9…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 16:21:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 688f91b9f4a9ec03715364a232d1d349 SHA-1: 50134fa594a46f9fc2f419c6a0dd13005a6ef0c1 SHA-256: da5299d1bff2ddf99734f931811500274154ebdca1ab8eaa6422a9f120d8bd4e
122 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, presenting a fake CAPTCHA or download button to trick users into clicking a malicious link. The embedded URL, https://netcdn.tw/app/431946152/robux-free-net-game-hack, is highly suspicious and likely serves as the initial point for downloading a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/robux-free-net-game-hack
    • http://akbidprimahusada.ac.id/elibrary/repository/how-to-pubg-uc-hack_GM1330123889.pdf
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-hacks-no-surveys_GM406889139.pdf
    • https://akbidprimahusada.ac.id/elibrary/repository/roblox-icebreaker-hack_GM431946152.pdf
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdf
    • http://akbidprimahusada.ac.id/elibrary//repository/minecraft-java-free-account_GM479516143.pdf
    • http://akbidprimahusada.ac.id/elibrary/repository/spin-coin_GM406889139.pdf
    • http://akbidprimahusada.ac.id/elibrary/repository/roblox-hackprogamers-com_GM431946152.pdf
    • http://akbidprimahusada.ac.id/elibrary//repository/roblox-games-with-free-boombox_GM431946152.pdf
    • http://akbidprimahusada.ac.id/elibrary/repository/free-robux-no-password-needed_GM431946152.pdf
    • http://akbidprimahusada.ac.id/elibrary//repository/mosttechs-coin-master-free-spins_GM406889139.pdf
    • http://akbidprimahusada.ac.id/elibrary/repository/how-to-cheat-money-on-roblox-retail-tycoon_GM431946152.pdf
    • http://akbidprimahusada.ac.id/elibrary/repository/how-to-speed-hack-in-roblox-simple-steps_GM431946152.pdf
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-gold-cards-free-2021_GM406889139.pdf
    • https://akbidprimahusada.ac.id/elibrary/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdf
    • http://akbidprimahusada.ac.id/elibrary/repository/minecraft-windows-10-code-free_GM479516143.pdf
    • https://akbidprimahusada.ac.id/elibrary/repository/free-robux-nordvpn_GM431946152.pdf
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-hack-coin-master-android_GM406889139.pdf
    • http://akbidprimahusada.ac.id/elibrary//repository/free-robux-glitch-2021_GM431946152.pdf
    • http://akbidprimahusada.ac.id/elibrary/repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdf
    • http://akbidprimahusada.ac.id/elibrary//repository/no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fe0.bin
862c8dfd5ce3e118ba76aacab1adb003149dccf08bde110107c2529ff0cb412b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE0 27864 bytes
font_01_sfnt_off00008f43.bin
89d7a8c49984a94f579ff2365be918aaf3c6a71af8bcabed0d763d3311615281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F43 18120 bytes

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