Malicious PDF — malware analysis report

Static analysis result for SHA-256 2326ff7b957cd253…

MALICIOUS

PDF

48.7 KB Created: 2021-06-09 16:48:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a438f38456f6aa4a271d1397a8204ff9 SHA-1: e32fdc0b163e45154bf0d372c2d825106fac419c SHA-256: 2326ff7b957cd253a0e46608baecb7736cb6f921d7bcacff7b54067135f8d0e2
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to deceive the user into interacting with a malicious link. This is supported by the 'SE_FAKE_CAPTCHA' heuristic and the presence of numerous URLs, including one directly linked to a 'how-to-get-free-robux' lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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/how-to-get-free-robux-2021-easy-step-by-step-game-hack
    • http://greenpasturesfarm.com.au/images/get-free-robux-gg_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/free-roblox-outfits-2021_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/roblox-free-badges-game_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/minecraft-free-ios_GM479516143.pdf
    • http://greenpasturesfarm.com.au/images/free-minecraft-pe-server_GM479516143.pdf
    • http://greenpasturesfarm.com.au/images/roblox-robux-hack-generator_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/coin-master-fan-page-facebook_GM406889139.pdf
    • http://greenpasturesfarm.com.au/images/how-to-get-free-robux-fast_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/how-to-sell-t-shirts-on-roblox-for-free_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/robux-matchcomfree-robux_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/coins-master-hacks_GM406889139.pdf
    • http://greenpasturesfarm.com.au/images/robux-gift-card-free_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/working-coin-master-hack_GM406889139.pdf
    • http://greenpasturesfarm.com.au/images/free-robux-no-survey_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/free-robux-com-no-verification_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/coin-master-spin-link-free_GM406889139.pdf
    • http://greenpasturesfarm.com.au/images/hacks-for-roblox-scpf-games_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • http://greenpasturesfarm.com.au/images/roblox-robux_GM431946152.pdf
    • http://greenpasturesfarm.com.au/images/scaffold-minecraft-hack_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000545f.bin
abf1c6ae4efd160189443d633a4859ff65c0a35de617be90788d612dca807403		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x545F 29960 bytes
font_01_sfnt_off000098c7.bin
433f3938dea7685caf3dfd28781541e90438202f0e6b3541983e57dea40daf64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C7 19268 bytes

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