Malicious PDF — malware analysis report

Static analysis result for SHA-256 27407e26dcca06f4…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 12:55:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b1c0e5f20bfadfb04bf9c07afac79e95 SHA-1: ceaa3410f236711977db277552861340bdb6d829 SHA-256: 27407e26dcca06f472a528d3ef0f0e05d1d6203b50b9bfec011d0ea01e7e8f3e
142 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or scam lure, employing a fake CAPTCHA to trick users into interacting with malicious links. The document contains numerous embedded URLs, including a primary target at https://netcdn.online/app/431946152/rbx-robux-game-hack, and a large farm of SEO-optimized PDF links hosted on library.umbjm.ac.id. The presence of these links and the fake CAPTCHA strongly suggest an attempt to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/rbx-robux-game-hack
    • http://www.library.umbjm.ac.id/repository/my-minecraft-account-was-hacked_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/roblox-how-to-get-free-clothes_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/new-free-money-links-coin-master_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-2021-robux_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/free-coins-for-coin-master_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/robux-free-gift-card_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/20210-robux_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-youtube_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-for-pc-free-download_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/pubg-uc-and-rp-generator_GM1330123889.pdf
    • http://www.library.umbjm.ac.id/repository/is-every-game-on-roblox-free_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/card-hack-in-coin-master_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-real-hack_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/robux-websites-that-work_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-play-roblox-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005009.bin
3f0c043ab4a55a61b6905054be8f84bbc47aacd37fc78be1706a9363560d0d44		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5009 24108 bytes
font_01_sfnt_off000086c8.bin
db335316de1c827679f476dd5ee7b92397be9666285fe33d80a402a572565b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C8 17852 bytes

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