Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaacf316ffaecc74…

MALICIOUS

PDF

43.7 KB Created: 2021-05-17 21:45:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7b1e6fe6178222d2bd0e7912f5677a75 SHA-1: 2e54608864b720ba99486d336d179b1722b7ce93 SHA-256: aaacf316ffaecc74849129b19626959ccb908c7040fe17ff675d8e4e320be8e1
82 Risk Score

Malware Insights

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

The sample is a PDF that displays a fake CAPTCHA to trick the user into clicking a link. The embedded URL, https://netcdn.xyz/app/406889139/free-spins-link-in-coin-master-2021-game-hack, is likely intended to lead to a malicious download or further compromise. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/free-spins-link-in-coin-master-2021-game-hack
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-generator-no-survey_GM431946152.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-microsoft-rewards_GM431946152.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/latest-coin-master-free-spins-link_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins-on-coin-master_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-make-roblox-clothes-for-free_GM431946152.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-apkmody_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-100-spin-slot_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-human-verification_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/mine-minecraft-games-for-free_GM479516143.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-download-pc_GM479516143.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-hack-tools_GM431946152.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/150-free-spins-coin-master_GM406889139.pdf
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/www-rubux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d17.bin
6eb5ddf2f4bc765a435ccddf9a16b1a4d17d9f6238ff421550e75b439ffad3bb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D17 25740 bytes
font_01_sfnt_off000087cf.bin
8f5be0faf1f43547a4f613946690c49555a623d75ecb5c591eda2449b2cabce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CF 18456 bytes

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