Malicious PDF — malware analysis report

Static analysis result for SHA-256 610a5621f5287da1…

MALICIOUS

PDF

49.5 KB Created: 2021-06-04 01:52:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a43833c46e0d41ce03063d9d7c374b13 SHA-1: 3296fadd556d7ab1fc0dbb1a464d6950f415a1a3 SHA-256: 610a5621f5287da1cf4262fdfe34a9d0eb2f2b51b49ed1314f74cccc5e9601c6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document displays a fake CAPTCHA, a common social engineering tactic to trick users into interacting with malicious content. It also contains an embedded URI pointing to a URL that promises free Robux, further reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, and the presence of an external URI suggests an attempt to download a second-stage payload.

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/431946152/how-to-get-free-robux-without-verifying-2021-game-hack
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spin-reward-links_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-update-2021_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-apk-free-download_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/oprewards-robux_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdf
    • http://library.itekes-bali.ac.id/repository/best-coin-master-hack_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-hack_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/roblox-studio-free-robux_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/pokemon-go-free-and-home-transfer_GM1094591345.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-reddit_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/free-800-robux_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/roblox-robux-page_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/free-robux-live_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-el-tiger-card-free_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/free-coin-master-gift-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052a8.bin
6e42221407b7f003f5af848225dacf5298e5f0a34678916c103d5316600d8e19		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A8 25396 bytes
font_01_sfnt_off00008daa.bin
64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAA 3884 bytes
font_02_sfnt_off00009a51.bin
854662d4ed02eaea1b0a0020fc7ac25fa5b331288bf96b43491be4028b138ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A51 19772 bytes

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