Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f3fbd11a72236f…

MALICIOUS

PDF

48.1 KB Created: 2021-06-07 20:07:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b7a57919da20f032890c0dce1eb04793 SHA-1: 140683b4e7abe8febec60054e59c01c73d41e512 SHA-256: 21f3fbd11a72236fe642bf4b54181e9bb4d18a2acae3c0d7f369207dc5cbc9cc
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 trick the user into clicking a link. This link, 'https://netcdn.tw/app/431946152/roblox-dragon-ball-z-final-stand-cheat-game-hack', likely leads to the download of a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-dragon-ball-z-final-stand-cheat-game-hack
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-minecraft-education-edition_GM479516143.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/was-minecraft-ever-free_GM479516143.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/pubg-uc-and-bp-generator_GM1330123889.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/roblox-free-items-glitch_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-free-spins-and-chips_GM406889139.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-for-free_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/prison-life-gives-free-robux_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-minecraft-maps_GM479516143.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/roblox-studio-free-robux_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/hack-mod-coin-master_GM406889139.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-online-hack-tool_GM406889139.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-free-spin-bonus_GM406889139.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-generator-no-verification_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/robux-link_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-no-password_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-free-spins-2021-generator_GM406889139.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-hack-online-no-human-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005291.bin
2cd27727d7cfeab276a30fd4a1be80af090180fa5b517112a75e7964a646ac9c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5291 25276 bytes
font_01_sfnt_off00008c23.bin
889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C23 2984 bytes
font_02_sfnt_off0000964e.bin
b3f6a2f96b6d4e473f1b33f708903d662a40f622f8e5a57a014a459c99d0ce7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964E 19288 bytes

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