Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af2dc7c5cec868a…

MALICIOUS

PDF

51.1 KB Created: 2021-05-13 21:05:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 30b57b74e022e68ef947e7e4aa08c453 SHA-1: df65ada76153ed5ffefae3e95595eb0df17b4910 SHA-256: 8af2dc7c5cec868aab94a64975892dc2d3bbc451f8e1927649deafeeda56c7bd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL, https://netcdn.xyz/app/431946152/roblox-games-that-give-you-free-robux-game-hack, likely leads to a malicious payload download. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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/roblox-games-that-give-you-free-robux-game-hack
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-hack-quora_GM406889139.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/hacks-to-get-free-robux_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-free-robux-easy_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/rbx-hut_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/games-that-give-you-free-robux_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/freerubux_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/minecraft-story-mode-free_GM479516143.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/rbxfree-com-free-robux_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-daily-spins-coin-master-2021_GM406889139.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-card-collection-hack-2021_GM406889139.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-free-download-pc_GM406889139.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-free-robux-codes_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-hack-pc-cheat-engine_GM406889139.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-roblox-gift-card_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-coin-master-links_GM406889139.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/minecraft-pe-apk-free-download_GM479516143.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-no-human-verify_GM431946152.pdf
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d7.bin
b221697408892f35472c851fe0d41eb2ab78e1390059092befae465ae50825e3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D7 28172 bytes
font_01_sfnt_off00008b9c.bin
a66b570a908761b39e6d9e18bcb667c353840a86c6a7db528f79d01abe6b23a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9C 2844 bytes
font_02_sfnt_off0000953e.bin
400ee760d8ba2af4a989a89998a708334648619bc88f048e6e7319998473a993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x953E 5756 bytes
font_03_sfnt_off0000a293.bin
af18d9cb6acc741702b59c78a5d378fdddaa2c6ad6fac2421576a1d1ac5dc213		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA293 19240 bytes

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