Malicious PDF — malware analysis report

Static analysis result for SHA-256 5261b8f33a7f0e70…

MALICIOUS

PDF

36.8 KB Created: 2021-06-26 00:33:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e65d353a3a24b3f92eb2a50ad791a0e3 SHA-1: 3e43b619612b8be9fcda00d5485be65b13080dc3 SHA-256: 5261b8f33a7f0e70cd5e8d192961183076f2f65ba8116bfd2df1340faf12a142
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious SEO link farm, designed to lure users with promises of free Robux and game hacks. It contains numerous embedded URLs pointing to other PDF documents, likely serving as a distribution mechanism for malware or phishing content. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-hack-100-works-trackid-sp-006-game-hack
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-hack-for-ios_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/minecraft-mac-free_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-script_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-rixty-codes-for-roblox-generator_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/is-roblox-free-to-play-on-pc_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-4all-cool-robux-hack_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-group-free-robux_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-dinosaur-simulator-how-to-get-megavore-for-free-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-private-minecraft-server_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/gamescraft-org-roblox-hack_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-spin-hack-without-verification_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-hacks-on-lumber-tycoon-robux_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-tiktok-fans-no-human-verification-ios_GM835599320.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-chest-in-coin-master_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-spins-ios-2021_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/rbx-gg-free-robux_GM431946152.pdf
    • https://www.roblox.com/.I
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003698.bin
bef38d1b9a86724a13b28a9af2a22bf1198dcdcae60716297b0c41c10703b4fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3698 22264 bytes
font_01_sfnt_off0000680c.bin
b55384e9b44ab89194dd254195d0144cec021062b62148aae9c7037f5ec60b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680C 20032 bytes

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