Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bfdbd8b27efe95…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 07:34:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 083b9650617e7d5a462c89e09db67228 SHA-1: 2b40762cf80f30639cc8a4bd1d6daf1293426a38 SHA-256: c9bfdbd8b27efe9571efdd297d75f3a0d651cae95b79e0b6e3a6950aa49f62af
102 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, pointing to various websites. The document body and extracted URLs suggest a lure related to game cheats and free items, likely to drive traffic to SEO-optimized pages or potentially host further malicious content. The ML classifier also strongly indicated maliciousness.

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/406889139/coin-master-15-free-spin-link-today-game-hack
    • http://eurosystemssrl.it/images/today-coin-master-free-coins-link_GM406889139.pdf
    • http://eurosystemssrl.it/images/coin-master-server-hack_GM406889139.pdf
    • http://eurosystemssrl.it/images/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://eurosystemssrl.it/images/free-links-for-coin-master_GM406889139.pdf
    • http://eurosystemssrl.it/images/links-for-free-spins-for-coin-master_GM406889139.pdf
    • http://eurosystemssrl.it/images/free-roblox-adopt-me-pets_GM431946152.pdf
    • http://eurosystemssrl.it/images/earn-free-robux-on-roblox_GM431946152.pdf
    • http://eurosystemssrl.it/images/coin-master-online-hack-no-human-verification_GM406889139.pdf
    • http://eurosystemssrl.it/images/best-minecraft-hacked-client_GM479516143.pdf
    • http://eurosystemssrl.it/images/free-coin-spin-daily-link-net_GM406889139.pdf
    • http://eurosystemssrl.it/images/robux-hack-free-robux_GM431946152.pdf
    • http://eurosystemssrl.it/images/free-spins-coin-master-blogspot_GM406889139.pdf
    • http://eurosystemssrl.it/images/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdf
    • http://eurosystemssrl.it/images/coin-master-coins_GM406889139.pdf
    • http://eurosystemssrl.it/images/spins-coin-master_GM406889139.pdf
    • http://eurosystemssrl.it/images/roblox-games-to-play-for-free_GM431946152.pdf
    • http://eurosystemssrl.it/images/games-that-give-you-free-robux_GM431946152.pdf
    • http://eurosystemssrl.it/images/coin-master-golden-cards-hack_GM406889139.pdf
    • http://eurosystemssrl.it/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://eurosystemssrl.it/images/coin-master-hack-online-without-human-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000481b.bin
4802f2104c4e6df43316b5e8c695311925f793dfe35cde69e9720bdf9c17d43b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481B 23992 bytes
font_01_sfnt_off00007ee8.bin
5b53a5b683b77cc6f0f815c556bf9926b59998be6e817bd3b756384118128b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE8 18652 bytes