Malicious PDF — malware analysis report

Static analysis result for SHA-256 897dff1e3fb14b14…

MALICIOUS

PDF

46.9 KB Created: 2021-05-17 13:13:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1e4842613ab3d9ea885ec3270604e1d1 SHA-1: 71c19aba12246a7be434d09cfa7d34f54c4e826c SHA-256: 897dff1e3fb14b14000b517455bd06a3123f9123161a0e3b0b7f203e469f54dd
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link, likely to download a secondary payload. The embedded URL and numerous other URLs point to sites offering 'free Robux' or game hacks, a common lure for phishing and malware distribution. No scripts were extracted, but the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/free-robux-giveaway-live-game-hack
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/www-roblox-com-robux-free_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-games_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/rbxdemon_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-minecraft-printables_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/game-give-free-robux_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-hack-generator_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/minecraft-hacked-client-112-2_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/minecraft-bedrock-edition-free_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/real-hack-for-coin-master_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-earn-free-robux_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/google-coin-master-free-spins_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-coins-in-minecraft_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bc1.bin
b90da450da8f6cd302d129ce7cbb09b4bdf3641ebf6e4db0062ac87194a3fa49		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC1 25712 bytes
font_01_sfnt_off00008679.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8679 3884 bytes
font_02_sfnt_off00009320.bin
3db94d24ba3abe2bdb9d310b65f8480e65e9005ffe127367b6d2ef8ae08c9d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9320 18820 bytes

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