Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfb9276add27f39…

MALICIOUS

PDF

33.3 KB Created: 2021-07-04 20:20:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3da6399383891e48c17eeb0c3cd9ef97 SHA-1: 20dccd971c2496386ac00b24909c4d9597d3ec88 SHA-256: 9cfb9276add27f3950b189655600ea0491961d37d26e7bdd34e7c7317bd63bc4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to websites that appear to offer game cheats and hacks, such as 'free-coin-master-cards-link-game-hack'. This suggests a phishing or malware distribution attempt, likely using a lure related to popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports this assessment.

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/free-coin-master-cards-link-game-hack
    • http://library.stieyapan.ac.id/repository/roblox-galaxy-arcade-resourcen-cheats_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/hacks-for-minecraft-windows-10_GM479516143.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-ios-hack_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-mod-version-free-download-v344_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/pokemon-go-free-latest-version_GM1094591345.pdf
    • http://library.stieyapan.ac.id/repository/how-to-get-a-free-dominus-in-roblox_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/rbxdemon_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/free-coin-master-androd-cheats-2021_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/minecraft-realms-free-codes_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/free-foxy-food-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-free-raid-link_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/free-coin-master-app_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/gamehunters-club-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/minecraft-windows-10-hacks_GM479516143.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-hack-android-root_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d3d.bin
fcd1fd41dd8d1093b32a701bb76c593133194438de3b0f50333bc4e4d2bf6e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D3D 22340 bytes
font_01_sfnt_off00005eff.bin
b2017717319ed1cc4a90f63cde4a7ca53e868056cc2e1441a2f5bc7eaddf4cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFF 18340 bytes

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