Malicious PDF — malware analysis report

Static analysis result for SHA-256 524f6ec49e446488…

MALICIOUS

PDF

45.4 KB Created: 2021-06-10 23:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 36760ba9b8019770a3d2cd7c8a8fd920 SHA-1: 7dca723a05ed0914ac817d34f6d069487c38881c SHA-256: 524f6ec49e446488725d92937675be8f10a350eee73c984db626b69731118dd4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are structured as SEO-optimized URLs pointing to other PDF files, suggesting a link farm designed to distribute malicious content. The primary URL, https://netcdn.tw/app/431946152/inspect-robux-hack-game-hack, and the numerous links on e-pustaka.stkipadzkia.ac.id are indicative of a lure to download game hacks or cheats. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.
  • 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/inspect-robux-hack-game-hack
    • http://e-pustaka.stkipadzkia.ac.id/repository/best-free-minecraft-skins_GM479516143.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/wurst-client_GM479516143.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/hack-para-ser-vip-en-flee-the-facility-roblox_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/infinite-robux-hack-2021_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/get-me-robux-for-free_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-robux-no-survey-no-downloading-apps_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-spin-link-of-coin-master_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/cheat-tool-jailbreak-pc-roblox_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/codes-to-get-free-robux_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-hack-online-download_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/roblox-fun-com-free-robux_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/fly-hack-for-roblox-2021_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-hack-apk-july-29_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/robux-hacks-2021_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/minecraft-pe-hack-client-2021_GM479516143.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-robux-meme_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004eb8.bin
d7885c22eaec388722293791c19a36c79a7306e869a8ef6bacd4ef2099a7c502		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB8 27500 bytes
font_01_sfnt_off00008e24.bin
2d2ae06f44d2a83f78632bc6effa2bf055d1ba455c227bb2942af196ac05dafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E24 18528 bytes

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