Malicious PDF — malware analysis report

Static analysis result for SHA-256 724812502c5c49d7…

MALICIOUS

PDF

46.0 KB Created: 2021-05-13 19:34:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 05e56f137ea9bb980f4d6556d58d19e3 SHA-1: 8eb7ce5cb19ef4828ac202952cd50e29224630fa SHA-256: 724812502c5c49d779ef96fcf0cd5d2e89e06c8d9ddd661d8a39ed5d57c05eec
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a fake CAPTCHA lure and embedded URLs, indicating a social engineering attempt to trick the user into downloading a payload. The ML classifier also flagged this PDF as malicious. The presence of external URIs suggests the document is designed to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/431946152/robux-game-hack
    • http://medimacs.eu/images/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://medimacs.eu/images/coin-master-daily-spin-free_GM406889139.pdf
    • http://medimacs.eu/images/how-to-get-free-coins-on-flip-master_GM406889139.pdf
    • http://medimacs.eu/images/minecraft-java-account-free_GM479516143.pdf
    • http://medimacs.eu/images/free-coins-coin-master-hack_GM406889139.pdf
    • http://medimacs.eu/images/roblox-moderators_GM431946152.pdf
    • http://medimacs.eu/images/http-bit-ly-coin-master-hack_GM406889139.pdf
    • http://medimacs.eu/images/roblox-robux-hack_GM431946152.pdf
    • http://medimacs.eu/images/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://medimacs.eu/images/minecraft-story-mode-free-download_GM479516143.pdf
    • http://medimacs.eu/images/freerobuxhack-us_GM431946152.pdf
    • http://medimacs.eu/images/free-robux-com_GM431946152.pdf
    • http://medimacs.eu/images/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • http://medimacs.eu/images/minecraft-free-download-mac_GM479516143.pdf
    • http://medimacs.eu/images/free-group-roblox_GM431946152.pdf
    • http://medimacs.eu/images/coin-master-links-for-free-spins_GM406889139.pdf
    • http://medimacs.eu/images/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://medimacs.eu/images/blox-best-robux_GM431946152.pdf
    • http://medimacs.eu/images/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://medimacs.eu/images/wurst-18_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000481f.bin
718dc3903bb78253e010946ce91e73dd3e27d4be64e91aae7e4409d942431994		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481F 25496 bytes
font_01_sfnt_off00008248.bin
ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8248 6700 bytes
font_02_sfnt_off00009286.bin
ccf20ca1ad80d0cd2f0d464461636129858ae353cf2c3769b35ef20048afdef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9286 17852 bytes

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