Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa883730c1662c54…

MALICIOUS

PDF

35.2 KB Created: 2021-07-07 07:42:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 343fc95b6f0e3cf940bd05fa79c0c64e SHA-1: f7b01c0cb5ab4faaca1c23a8a3d4fe739921d320 SHA-256: fa883730c1662c546ed1f665d014a1f8fb00d083f96f1fbefa0cc9b085399a9c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, all pointing to sites offering game hacks and free in-game currency. The primary URL, http://netcdn.tw/app/431946152/free-roblox-hack-game-hack, is likely a lure to download a malicious payload. The ML classifier strongly indicates malicious intent, and the presence of a download button heuristic further supports this. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

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.tw/app/431946152/free-roblox-hack-game-hack
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/2021-free-games-to-play-roblox_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/get-free-robux-2021_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-star-codes-roblox_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/freerobuxcodegenerator-roblox-free-robux-generator_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/can-u-u-use-cheat-engine-on-roblox_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/minecraft-windows-10-hacked-client_GM479516143.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-free-400-spin-link_GM406889139.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/is-roblox-free-on-three_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/master-coin-free-link_GM406889139.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-anime-cross-2-hack_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/pokemon-go-free-app_GM1094591345.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-pin-codes_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/gamehunters-club-coin-master_GM406889139.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack-on-a-tablet_GM431946152.pdf
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/games-like-coin-master-for-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003370.bin
b2d6a8c9e3c73dc035050ae1c42b6c753a8b745cb1d6c127e6026a947d76df9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3370 22292 bytes
font_01_sfnt_off00006566.bin
cf67562a6930539490549aeb8f0b318a0b45b3e5cb7414ef3283f960707338b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6566 18820 bytes

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