Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f000e4acd5bdb…

MALICIOUS

PDF

33.7 KB Created: 2021-06-29 19:07:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3e10c44fe3b09ba525395127812bb031 SHA-1: 85f9c3befd7631e1e35363ee19c64f3def91532f SHA-256: bf8f000e4acd5bdbfb429d628a91891946e19795c75d2ac772e3dbdb2ba7caa1
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a specific URL, http://netcdn.co/app/431946152/free-me-robux-game-hack, all related to game hacks and free virtual currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO abuse tactic. The presence of a "download button" lure further supports the malicious intent of directing users to download potentially harmful content.

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-me-robux-game-hack
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/roblox-speed-hack-download-2021_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/roblox-free-not-to-download_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/how-to-win-free-robux_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-robux-https-robuxplanet-com-r_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/roblox-free-aimbot_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/robux-codes-free-2021_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/minecraft-games-free-to-play-online_GM479516143.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-robux-websites-that-work_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/roblox-meme-t-shirt-free_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/how-to-coin-master-hack_GM406889139.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/how-to-hack-roblox-with-cheat-engine-561_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/hacks-para-juegos-de-roblox_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/roblox-hack-for-change-music_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-robux-prmo-code_GM431946152.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/coin-master-apk-mod_GM406889139.pdf
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/roblox-games-robux-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e0e.bin
613c48e41588791af3cb870f95d85d122cb334af090a9747b5ad68fba5ffd859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0E 22140 bytes
font_01_sfnt_off00005ef7.bin
391e0a91f0e9a75b2e160fe42ce9add36521c9bc4d45f084a66e0520b0698e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF7 18912 bytes

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