Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a07a6460ba1db9…

MALICIOUS

PDF

41.8 KB Created: 2021-05-12 02:03:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7b14f35abc0a071858b8d6f69a813f5f SHA-1: e15495f70d9ddaae0847056a8d14b57185df2b02 SHA-256: 52a07a6460ba1db9c648f81de8bb2a1af531569aff1037254af7c5ccd0175969
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA and a download button, designed to trick the user into downloading a malicious file. The document also includes an external URI pointing to a potential payload, which is consistent with a phishing or social engineering attack. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/hack-coin-master-for-iphone-game-hack
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/_GM479516143.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-youtube_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-games-on-roblox_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-blogspot_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-coin-master-spin-daily-link_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-instagram-free-spins_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-minecraft-maps_GM479516143.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-spins-coin-master_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-70-spin-link_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/hacked-roblox-game_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-gold-cards-free_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/robux-generator-no-verification-2021_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-that-actually-works-2021_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/roblox-com-hack_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-roblox-gift-card-codes_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-hair-roblox-boy_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049f7.bin
93f8d60519c50e1461673786ea04b90904679b2762b7eaad6dd38d8c5dec7e65		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F7 24288 bytes
font_01_sfnt_off00008153.bin
a643bdf6fb2c46f92d7d27c645ae746f9817b2095321c6eed50ee62637779c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8153 18220 bytes

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