Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f1700f25b3b9bf…

MALICIOUS

PDF

36.4 KB Created: 2021-07-04 01:33:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 953fe38053bc53a5887d81fe6a396a4c SHA-1: 65cc720d7c7770707456765e1ed2cea20de196e8 SHA-256: a1f1700f25b3b9bfcbc8ff96d3809eb3d6c5ab573563a9b05981971e74ca0842
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files related to game cheats and hacks. The presence of a "PDF_SEO_LINK_FARM" heuristic firing and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the document's structure and embedded URLs suggest it functions as a lure to download further malicious payloads or engage in phishing activities.

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/406889139/coin-master-free-spins-2021-game-hack
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/minecraft-windows-10-free-code_GM479516143.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-online-hack-tool_GM406889139.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-hacks-inspect-roblox_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/hack-to-get-money-on-roblox_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-games-to-download-like-roblox_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-live_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/best-free-minecraft-servers_GM479516143.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/blox-fish-free-robux_GM431946152.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-coins-for-coin-master_GM406889139.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdf
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/cm-spin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000038b2.bin
a72737916c60b4a8bb7b4254ef0d36f442bf61c3aeaed5069080cebbd7f96926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x38B2 22516 bytes
font_01_sfnt_off00006ae0.bin
a126babb65047b6746617d7d7f27a00b485a4a24246b96e57b4b97a03add53e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE0 18576 bytes

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