Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f0a91d61ac81b8…

MALICIOUS

PDF

46.6 KB Created: 2021-06-11 11:09:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ed4d9609cc6969645f5f5b65b56fc630 SHA-1: 22cfb4eea5afb9ffaf534867bafcb8b9425e1ba9 SHA-256: 66f0a91d61ac81b844e4cf17102667599cb6028fe9b05b98e17b09843dbdd8e8
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA lure to entice users to click on embedded links. The primary link, https://netcdn.tw/app/431946152/segunda-guerra-mundial-roblox-mapa-free-game-hack, likely leads to the download of a second-stage payload. The presence of multiple similar URLs suggests a campaign focused on distributing potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/segunda-guerra-mundial-roblox-mapa-free-game-hack
    • http://digilibfisip.unla.ac.id/repository/grabpoints-robux_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdf
    • http://digilibfisip.unla.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdf
    • http://digilibfisip.unla.ac.id/repository/hack-coin-master-free_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/free-roblox-accounts-2021-august_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/free-robux-codes_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/martian-lettuce-coin-master-free_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/can-i-get-minecraft-for-free_GM479516143.pdf
    • http://digilibfisip.unla.ac.id/repository/free-robux-real-2021_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-injection_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/free-spin-coin-master-online_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/get-roblox-items-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ed9.bin
34471b6cc52ad5949467637ea9fd17391504096638c9b6fa7f1189b08e13a859		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED9 28880 bytes
font_01_sfnt_off000090a3.bin
63ba23aef33803dced277b8b5ff34a95bb96388b54c27cb32314149ef280a1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A3 19272 bytes

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