Malicious PDF — malware analysis report

Static analysis result for SHA-256 2791cb44bf966977…

MALICIOUS

PDF

42.1 KB Created: 2021-05-11 12:37:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 762bf8edd6fa7dbabecc3c72d3eb4ab1 SHA-1: 978abdffa35df4eb0ef7e43ae3e9b591b25c1b70 SHA-256: 2791cb44bf9669779044e5f23f16589f90db2568bfbb1f22355d49f5fd18b1d4
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to resources related to game cheats and hacks. The ML classifier and PDF link farm heuristics strongly indicate malicious intent. The document body and extracted URLs suggest a lure for users seeking in-game advantages, which is a common tactic for phishing or distributing further malware.

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-free-spins-facebook-game-hack
    • http://urezerv.com/images/free-roblox-clothes-and-hair_GM431946152.pdf
    • http://urezerv.com/images/easy-way-to-get-free-robux_GM431946152.pdf
    • http://urezerv.com/images/hack-coin-master-apk-2021_GM406889139.pdf
    • http://urezerv.com/images/coin-master-free-cards-link-2021_GM406889139.pdf
    • http://urezerv.com/images/minecraft-pe-apk-free-download_GM479516143.pdf
    • http://urezerv.com/images/coin-master-hack-tool-india_GM406889139.pdf
    • http://urezerv.com/images/spin-coin-master-hack_GM406889139.pdf
    • http://urezerv.com/images/roblox-girl_GM431946152.pdf
    • http://urezerv.com/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://urezerv.com/images/free-robux-generator-no-verification_GM431946152.pdf
    • http://urezerv.com/images/minecraft-hacked-client_GM479516143.pdf
    • http://urezerv.com/images/free-modded-minecraft-server-hosting_GM479516143.pdf
    • http://urezerv.com/images/free-coin-master-spin-daily-link_GM406889139.pdf
    • http://urezerv.com/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://urezerv.com/images/rbx-gg-free-robux_GM431946152.pdf
    • http://urezerv.com/images/coin-master-hack-free-spins_GM406889139.pdf
    • http://urezerv.com/images/roblox-fly-hack_GM431946152.pdf
    • http://urezerv.com/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
    • http://urezerv.com/images/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://urezerv.com/images/robloxheroxyz-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048d2.bin
2153c164f5b4b0936762cacbd7adaa47033a5676f08b236575e4aa4bdb099460		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D2 25212 bytes
font_01_sfnt_off0000824f.bin
a7d0484bdc545634c9b46f4dcbf794c30064c3aaaf3cdd537b213ac19f08a95c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x824F 18212 bytes

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