Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af6235b7a5afbe9…

MALICIOUS

PDF

48.0 KB Created: 2021-06-03 22:12:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 46d52533ecc4602dbcb53615fc5e8a7b SHA-1: ac2e2ab90d6b10fb1502a714503790d0059bff07 SHA-256: 4af6235b7a5afbe92e4beccb9870971b0bf37eadefeaaf3202acfa2fe4d28de0
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URL, https://netcdn.online/app/406889139/free-spins-on-coin-master-game-hack, likely leads to a second-stage payload or phishing page. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/406889139/free-spins-on-coin-master-game-hack
    • http://library.ft.upnvj.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/roblox-but_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/free-coin-master-spin-app_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdf
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/earn-robux-online_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/try-minecraft-free_GM479516143.pdf
    • http://library.ft.upnvj.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/get-more-robux_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spin-link-new_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/free-robux-redeem-codes_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • http://library.ft.upnvj.ac.id/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • http://library.ft.upnvj.ac.id/repository/optifine-minecraft-pe_GM479516143.pdf
    • http://library.ft.upnvj.ac.id/repository/robux-win_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/robux-com-free-robux_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005164.bin
ced2a597de512f3a8f964e6c1aded70d3a6413825947892acd56025a8881a58c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5164 29844 bytes
font_01_sfnt_off0000902b.bin
64c53edae7920bc04119553d13e7f88c7ab8c9d6abd0f5e62be35afdb33f76ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x902B 2920 bytes
font_02_sfnt_off00009a47.bin
addbd5428a422ca7211e94293fed3a4f98c85d5f6337328d4d3623e90d90c649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A47 17884 bytes

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