Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60cf66a6ffe4c98…

MALICIOUS

PDF

35.6 KB Created: 2021-06-30 05:55:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1a718daa310867a77c384216af4354ef SHA-1: c901846ef42d862e4649e74c3529a686ee89ee8d SHA-256: a60cf66a6ffe4c98a9cf196b899589111d946ab57716a5ae341e50d0550963a4
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are part of a link farm, suggesting a deceptive purpose. The document body and extracted URLs indicate a lure related to game hacks and free items for games like Roblox and Coin Master. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

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/how-to-get-free-hats-robloxs-game-hack
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/hack-version-of-coin-master_GM406889139.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/google-coin-master-free-spins_GM406889139.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/comment-cheater-sur-roblox-retail-tycoon_GM431946152.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/email-roblox-about-hacked-account_GM431946152.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/free-coin-master-cards_GM406889139.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/coin-master-claim-spins_GM406889139.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/coin-master-free-spins-link-facebook_GM406889139.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/roblox-admin-panel-robux-hack_GM431946152.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/inappropriate-roblox_GM431946152.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/free-mobile-360-robux_GM431946152.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/toolbox-for-minecraft-ios_GM479516143.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/how-to-get-22-500-robux-for-free_GM431946152.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/engine-roblox-hacker_GM431946152.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/coin-master-hack-app-for-ios_GM406889139.pdf
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/80-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003334.bin
85db5cd4b43196aba43b372ee3baa9a384c4a73f4b7c264b1a3a60d0e8bd1a14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3334 22988 bytes
font_01_sfnt_off00006696.bin
34b759b3a611b604723812540a566961c1c8cc9f165a10fc3ab387b08a8a78b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6696 18920 bytes

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