Malicious PDF — malware analysis report

Static analysis result for SHA-256 213d3fdc2e76961f…

MALICIOUS

PDF

34.7 KB Created: 2021-06-29 20:41:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b5dcf5766a53090c257830e44a033eb8 SHA-1: 5c2eef8cc06b9d561cfc5df5c5074dcb25532bd7 SHA-256: 213d3fdc2e76961fc17596762f379e46ee45c2bbfa7d3208b0d7825c3e767858
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It also contains numerous embedded URLs, with the primary one being http://netcdn.co/app/431946152/how-to-get-2021-robux-for-free-2021-game-hack, suggesting a lure for scams or malware downloads. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-2021-robux-for-free-2021-game-hack
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-login-hack_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-spin-free_GM406889139.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-online-free-spin_GM406889139.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/free-coin-master-spins-2021_GM406889139.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/earn-free-robux-for-roblox_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/easy-robux-today-com_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/mc-hacks_GM479516143.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-buying-2021000-robux-hack_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-windows-10-free-with-java_GM479516143.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/general-roblox-script-hack_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-adopt-me-hack_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/best-free-minecraft-servers_GM479516143.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-online-hack_GM406889139.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-cards_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/to-get-free-robux_GM431946152.pdf
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/free-gaming-like-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003121.bin
93262f1bdd5bb566780b8a6c6899709691eed86e1895c978b328c3de1fe4c886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3121 21916 bytes
font_01_sfnt_off00006194.bin
d24c0e100c944da15398cc03dd439e143cfc9f9497013523985f2333f6259ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 19384 bytes

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