Malicious PDF — malware analysis report

Static analysis result for SHA-256 936627bb9c71725b…

MALICIOUS

PDF

43.3 KB Created: 2021-05-19 15:12:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d1301d4a587bdb1593fe7cfa946b584d SHA-1: 1d3e99310fcc3fa070587cfb0d9be6c378667e11 SHA-256: 936627bb9c71725b1c52d0bb286e0acd918c2b4c6e9d190b4260e02558e444ac
102 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files hosted on the same domain, suggesting a link farm designed to attract users searching for game cheats or hacks. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate malicious intent. The primary goal appears to be directing users to download further content, likely malicious, under the guise of providing game-related exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-become-a-hacker-in-roblox-game-hack
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/free-robux-generator-without-verification_GM431946152.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/free-spins-on-coin-master-hack_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/minecraft-windows-10-key-free_GM479516143.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-hack-spin-ios_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-root-hack_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/minecraft-pe-mod-menu_GM479516143.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/robux-hack-no-human-verification_GM431946152.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/synapse-roblox-free-download_GM431946152.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/get-free-spins-on-coin-master_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/how-do-you-get-roblox-money_GM431946152.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/get-free-cards-for-coin-master_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-gift-link_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/how-to-get-robux-without-paying_GM431946152.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-free-spins-link-download-ios_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/free-spins-on-coin-master-link_GM406889139.pdf
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/roblox-gift-card-online-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c86.bin
0d4b86dd117de339a91ecae00318efc23f3c583e3b2091fd47bd0f0f0bb836f2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C86 24732 bytes
font_01_sfnt_off000085ec.bin
64431d83c1c466192ca6f90c953545fb4db60ca1c30fe2a26ad653d3315a559e
pdf-font-stream PDF embedded font (sfnt) at offset 0x85EC 18608 bytes