Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c89d0aef64b55a…

MALICIOUS

PDF

48.5 KB Created: 2021-05-14 10:12:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b4ed485b977064014a0d2c5a8854f2af SHA-1: c049a997bf2d14ba36996efa8327441865663452 SHA-256: 29c89d0aef64b55af6688623f0a93b24fc7273e45a78b3249546828771807f6a
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a download button to trick the user into downloading a malicious file. It also contains multiple embedded URLs that likely lead to further malicious content or downloads. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/431946152/robux-converter-game-hack
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-spin-link-coin-master-today_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/online-hacking-tricks-coin-master_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-spins-16-04-19_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-apk-hack-32_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-hack-no-survey-or-verification_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-time-hack-2021_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/minecraft-free-education_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/get-free-robux-2021_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-hack-355_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/robux-hacks-2021_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/when-was-minecraft-free_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-no-verification_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/minecraft-wurst-hacked-client_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/master-coin-hack-app_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/hacks-for-minecraft-bedrock_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-o-get-free-coin-master-spins_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-spins-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004be4.bin
edfc4936f45ecd07930b9dcc877f0d76689d13c364d2a6033038e93594823c98		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE4 31028 bytes
font_01_sfnt_off0000920b.bin
baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920B 2844 bytes
font_02_sfnt_off00009bcd.bin
445b05a7d025cae97bc3d237a95317cdc5e9af3154d94cfe5f369ebdcdfa036d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCD 18068 bytes

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