Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbffc3d06b6e27ea…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 17:12:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bf20294c023e25a8637328b34344168c SHA-1: eff2738b056748680184bff2d02661b2ce71c2b5 SHA-256: dbffc3d06b6e27eaee37eb0c0ac444e677662ea2a32e7afcfc3350cdb7ac141d
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into clicking a link, which is a common social engineering tactic. The embedded URL, https://netcdn.online/app/431946152/robux-no-human-verification-game-hack, likely leads to a malicious download. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/robux-no-human-verification-game-hack
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/how-to-get-free-followers-on-tiktok_GM835599320.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/orewards-com-free-robux_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/spin-coin-master-hack_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/worst-roblox-avatars_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/minecraft-cheat-client_GM479516143.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/coin-master-claim-spins_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/free-robux-please_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/roblox-hack-com_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/minecraft-pe-free-download-ios_GM479516143.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/minecraft-font-free_GM479516143.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/coinmaster-spin-ml-free_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/robux-hack-free-robux_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/minecraft-114-download_GM479516143.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/free-robux-survey_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/coin-master-free-spins-apple_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005171.bin
75e20f23348ce035dba3b94d0f2ba2afe4e8d93672cd5deb4f1f057119c123dc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5171 26580 bytes
font_01_sfnt_off00008d92.bin
b0b7efb10b2be72ca1f11f5058a16b7f706f868f5fc2e7590f71e4c885e22b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D92 18696 bytes

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