Malicious PDF — malware analysis report

Static analysis result for SHA-256 f316493705079e4d…

MALICIOUS

PDF

35.3 KB Created: 2021-06-20 08:35:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4da3df4f9e1bed1711ff3391db25370a SHA-1: 2096140468775aaf131e867076bad5c7b392d628 SHA-256: f316493705079e4dd207d79fa39a9a273ff28d3c7d7256a6f18d5ef82530db11
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, with the primary one being http://netcdn.co/app/431946152/free-robux-no-survey-android-game-hack, which is presented as a lure for free Robux. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to provide a password for an archive, a common tactic to bypass security filters. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.co/app/431946152/free-robux-no-survey-android-game-hack
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/robux-offers_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/give-me-free-robux-plz_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-tiktok-accounts-and-passwords_GM835599320.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-roblox-website_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-rewards_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/pubg-uc-zip_GM1330123889.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/all-players-in-roblox-passwords-password-hack_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/minecraft-life-hacks_GM479516143.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-hack-god-simulator-roblox_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/slaying-simulator-roblox-no-cheat_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/buy-robux-free_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-multiplayer-minecraft-server_GM479516143.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-2021-no-survey-no-download_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-real-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000315c.bin
783b68c404184b55622c46535c8b802d4c83ced85bf03bf6a7e3b5604190071b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x315C 22664 bytes
font_01_sfnt_off00006453.bin
3c03f9add6e9fd1716d3b24945b5a307958554e5fc4b1ff629fa7304dadf0f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6453 19304 bytes

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