Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d7c647057723d6…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 02:15:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8f64c0bfe63de9f5818e47fd8462bc75 SHA-1: d63d00ee2503fcd88a67ed6d2fe00a8ca902716e SHA-256: c2d7c647057723d62c71be9e1a6c29b0bb07e11737a55d95c27da4e778dc9379
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous external links, identified as a PDF link farm, likely intended to drive traffic to various websites. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious document, possibly delivered via spearphishing.

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/479516143/is-there-a-free-version-of-minecraft-game-hack
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-com-free-accounts_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/ways-to-gt-back-a-hacked-account-on-roblox_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/gamekit-roblox-800-robux-free_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-hack-2021-android_GM406889139.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/easy-free-robux-in-roblox_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-chromebook_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/tips-free-roblox-robux-generator-2021-no_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-add-mods-to-minecraft-pe_GM479516143.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/bloxland-earn-free-robux_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-get-free-friendly-smile-for-real-pastebincom-roblox_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-come_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-fb-free-spins-link_GM406889139.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-games-at-roblox-download_GM431946152.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-microsoft_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035c8.bin
3f0ac9ed1dc4bac51583c3f5517c5934c93bc9f961c1207c6848fd353603d8e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35C8 22344 bytes
font_01_sfnt_off000066dd.bin
555136c24bc0cc7b26cdfc0df6c1cd4857b7d13fa5348b764e09ccd429d35249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DD 18296 bytes

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