Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e8d3127c9af4d5…

MALICIOUS

PDF

43.1 KB Created: 2021-05-12 16:30:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4c071cc497be306b7bc74c45c71d9349 SHA-1: cf991c73482a4df0640d1c29a9f7f066b6d284c3 SHA-256: 98e8d3127c9af4d5cb1644becd7965de10744e3e83b2272230cbd76d890d61bf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that explicitly mentions 'Free Robux' and 'free coins', indicating a lure for users to visit potentially malicious websites. The heuristic 'PDF_SEO_LINK_FARM' further suggests a large number of external links were generated, likely for SEO manipulation or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-robux-com-2021-game-hack
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/free-coin-master-spin-generator_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/free-coin-master-coins-and-spins_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/coin-master-hack-lost-world-2021_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/coin-master-hack-version-33-2_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/hack-my-spins-coin-master_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/coin-master-online-hack-2021_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-generator_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/free-spins-coin-master-blogspot_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/master-coin-free-spin-daily_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/free-roblox-script-executor_GM431946152.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/minecraft-windows-10-edition-free_GM479516143.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/get-free-spins-in-coin-master_GM406889139.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/roblox-hack-unlimited-robux_GM431946152.pdf
    • https://e-learning.man1boalemo.sch.id/__statics/gudangsoal/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b45.bin
4450ce80e21c4d6035b294e85e83385d6066c9731fb1c7de212b87a8e416c704		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B45 25276 bytes
font_01_sfnt_off000084ca.bin
db7deb15448d884d15c6a42f746ab8a768d26593fd7e085f0109997e06cd96ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CA 18676 bytes

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