Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0685127b7c39b7a…

MALICIOUS

PDF

44.7 KB Created: 2021-05-19 12:02:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 00ce8799eb651dacb3cd36385ed3a943 SHA-1: 093a35fb4bad31212bac8f0f422f8911ebd299a0 SHA-256: c0685127b7c39b7af58b3521f91f3b58ad466f4aab511c5d4f067dcf44522cff
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document employs a fake CAPTCHA lure to deceive users into clicking malicious links, likely to download further malware or redirect to phishing sites. The presence of multiple URLs pointing to game-related hacks and cheats suggests a social engineering tactic to exploit user interest. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/431946152/robloxhacks-game-hack
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/aternos-free-minecraft-server_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-free-spins--coins-2021_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-minecraft-java-edition-account_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-download-minecraft-hacks_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-coin-master-spins_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-minecraft-java-edition_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-coins-coin-master-2021_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-a_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/minecraft-free-download-mobile_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-minecraft-account_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-no-verification-needed_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-robux-generator-no-human-verification_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-hack-generator_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-daily-free-spin-and-coin_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-hack-download-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac8.bin
f6b5e6407ba15e50d8b8ad36e313ea6e1bfba9b064985624a8e8ee5fce282662		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC8 24220 bytes
font_01_sfnt_off0000825b.bin
77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825B 2832 bytes
font_02_sfnt_off00008c0c.bin
4c82b5acf2344fb6074e769b7bb8f458d53ebd76102ce4f277dd7245c06f6447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0C 18348 bytes

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