Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5465cbb99cd9908…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 04:28:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 18f26497ef0c465a994a7b52b00b518a SHA-1: 0cef3816d88c1eaa5591efda2f137e5b97fd4c24 SHA-256: e5465cbb99cd99087679b6d082e61737a542ea5cdb2bb4d7918072bd90287f9e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external documents, many of which appear to be SEO-optimized lures for free in-game items or hacks. The primary URL, https://netcdn.online/app/431946152/rbxdemon-game-hack, suggests a download or execution attempt. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/rbxdemon-game-hack
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-link_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/hack-coin-master-without-human-verification_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/games-to-get-free-robux_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/roblox-adopt-me-hack_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/minecraft-116-free-download_GM479516143.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-com_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/minecraft-toolbox-premium-apk_GM479516143.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/hack-coin-master-game-apk_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/minecraft-gun-games-free_GM479516143.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/minecraft-tools_GM479516143.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-generator-no-verification_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/tiktok-free-shares_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb4.bin
dff95330b1ad161d552b5e9734f239e210b61b303275703ba7cf0d8099e86d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB4 25344 bytes
font_01_sfnt_off0000897f.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897F 5696 bytes
font_02_sfnt_off00009691.bin
84e994ea3e0766e4b6b44f1efc08852f1b1b6721f581ba32b946cb803bfb180d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9691 18144 bytes

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