Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc146b052705c42…

MALICIOUS

PDF

46.5 KB Created: 2021-06-07 08:40:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 32ca9c369e3540a714457d6e89ae3bd6 SHA-1: 593cdef2aa169e300f84d5b056459cf205fd87b9 SHA-256: bdc146b052705c42298113aa074fbfb275effdb049a46519ac0d68c80ebda489
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into downloading a payload from an external URL. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a lure related to game cheats or hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-speed-hack-mobile-game-hack PDF link annotation
    • https://www.manmed.info:443/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/spin-link_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50BB 28780 bytes
SHA-256: c0cb3d502a965b60e82cc53d7324154fe672c585ed51d6aa31b6245484d09d6c
font_01_sfnt_off000091b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B8 18848 bytes
SHA-256: b4c9c698598dd875ef7c3b3cb0a8309ec8998ce7bdfa4c49523e76d5df49220e

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