Malicious PDF — malware analysis report

Static analysis result for SHA-256 db820bfab4cc2919…

MALICIOUS

PDF

44.0 KB Created: 2021-04-26 23:24:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1ea26394f454d444c6e29fab2e84beac SHA-1: 715f32e5356e5abd0e98ff499bf4ce648d6d3606 SHA-256: db820bfab4cc2919d75777ea79a490cfc9526e4828667270d846efc3fccadb8c
82 Risk Score

Malware Insights

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

The document uses a social engineering lure related to 'Free Robux' and includes a prominent call-to-action, indicating an attempt to trick the user into downloading a malicious file. The presence of embedded URLs, including one pointing to 'netcdn.xyz', suggests the document is designed to redirect users to a download site. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a malicious intent to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 4

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/free-robux-hack-windows-10-game-hack
    • https://lib-stie.yai.ac.id/repository/free-online-games-for-pc-similar-to-roblox-no-download.pdf
    • https://lib-stie.yai.ac.id/repository/all-free-hair-roblox.pdf
    • https://lib-stie.yai.ac.id/repository/good-roblox-games-about-cities-for-free.pdf
    • https://lib-stie.yai.ac.id/repository/free-robux-generator-email-verification.pdf
    • https://lib-stie.yai.ac.id/repository/is-roblox-downloadable-on-ps4-for-free.pdf
    • https://lib-stie.yai.ac.id/repository/free-russian-flag-roblox-t-shirt.pdf
    • https://lib-stie.yai.ac.id/repository/get-free-roblox-the-very-very-easy-way.pdf
    • https://lib-stie.yai.ac.id/repository/roblox-halloween-simulator-cheat.pdf
    • https://lib-stie.yai.ac.id/repository/hacking-discord-server-roblox.pdf
    • https://lib-stie.yai.ac.id/repository/roblox-natural-disaster-fly-hack.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004043.bin
429cc8a6f27f0e00b6188b7ee3b4782c3e0903766eaecb5114ce413817e97b42		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4043 26688 bytes
font_01_sfnt_off00007d03.bin
77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D03 2832 bytes
font_02_sfnt_off000086b3.bin
fec05ca740336714e55d3edaf8029a142f05acedcde9838c535a204a0e210af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B3 19344 bytes

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