Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55a5c8eeb25bb35…

MALICIOUS

PDF

35.9 KB Created: 2021-06-18 10:39:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f139f92bdacd16b0d4a6792d193b8a54 SHA-1: 6c83b02244e9feaeec10e7417662023cc7b37f83 SHA-256: b55a5c8eeb25bb350e40eded8119af00a772bee413875b6b23dcf65f364b72e2
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are structured to appear as SEO-optimized content related to game hacks and cheats. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external PDF files suggests a link farm designed to distribute malware or lead users to phishing sites. The document body explicitly mentions 'Roblox Free Robux Generator' and includes URLs pointing to such generators, indicating a lure for potentially unwanted or malicious downloads.

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/roblox-free-robux-generator-no-human-verification-2021-game-hack
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/hack-roblox-players_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/hacks-to-get-free-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-robux-easy-and-fast_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/roblox-restaurant-tycoon-hack-pastebin_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/minecraft-aimbot_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/static-moonactive-net-free-spins-coin-master_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-gold_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/archery-master-3d-coins-hack_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-spin-redeem-code_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-robux-hacker-us_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/robux-free-gift-card_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/roblox-fly-hack_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-not-fake_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/minecraft-free-download-no-virus_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032d3.bin
2db4d0e6eda80f1254c41176ed81b2e55888d696ea893c5510e156a4e5111f9c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D3 22712 bytes
font_01_sfnt_off000065dd.bin
e0ce9e236c0291320616b474a7cd7966da7d0c89e40d1b6ae74ff0e981fdfba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DD 19624 bytes

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