Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc279bdcf9f2910…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 09:30:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ba61acaaf439eddff6c30ea8e5a84cda SHA-1: f48d87ca61e9b7b15f1e5637ac9697aab0b0f2e4 SHA-256: 7fc279bdcf9f2910a0841953a68e0e2eba90d0380acfbc87b5a41680038ae8c2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are structured as SEO-optimized PDF gateways pointing to resources related to game hacks and free in-game currency. The primary URL, 'https://netcdn.tw/app/431946152/hack-app-roblox-game-hack', suggests a lure for downloading an application. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/hack-app-roblox-game-hack
    • http://elib-s2.ubl.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdf
    • http://elib-s2.ubl.ac.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdf
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/free-ninja-run-roblox_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-robux-hack-v1-34-download_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdf
    • http://elib-s2.ubl.ac.id/repository/real-robux-hack-no-survey_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-hack-999999-robux-tablet_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/get-free-robux-easy-2021_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/free-tiktok-followers-generator_GM835599320.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-free-packages-2021_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdf
    • http://elib-s2.ubl.ac.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-how-to-get-free-clothes-on-phone_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-free-400-robux_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/free-yellow-roblox-girlfriend_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/cheat-tools-for-roblox_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/free-1-000-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050c7.bin
8f3ba6ccf8b2d20d8ca2d554eaa59d1d296c43fb6a358d47cd511bf8f0c2a0ba		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C7 26532 bytes
font_01_sfnt_off00008d1d.bin
a448267da47f4695add8e24501f14b654c075e5e8156792c49fd61359efe7cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1D 18356 bytes

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