Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88cb8910ddefde2…

MALICIOUS

PDF

51.4 KB Created: 2021-06-09 05:27:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1595e4b6925f6b037dde6d516302c9ed SHA-1: 2a439899527deab34aafe9386f41e6ff7d5a9e95 SHA-256: c88cb8910ddefde240c8ae75c1ca92f071c38e05271cb3c80a98effd9b36977c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to pages discussing game hacks and cheats. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests a link farm or a lure for users to download potentially malicious content. No scripts were extracted, but the document body and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/what-is-roblox-hack-game-hack
    • http://library.stieyapan.ac.id//repository/how-to-get-free-hair-in-roblox_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/free-mods-for-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/easy-coin-master-hack-without-verification_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/minecraft-hacks-ps4_GM479516143.pdf
    • http://library.stieyapan.ac.id/repository/free-minecraft-skins-xbox-one_GM479516143.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-homepage_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/roblox-heroes-online_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-hack-root_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-hack-2021-app-download_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/free-spins-on-coin-master-links-2021_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-spins_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/earn-points-for-robux_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/mcpe-master-coins-hack-download_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/roblox-rewards-site_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000521f.bin
584d62ad264e49b8d33800b85be1d6cca918a704c6b19d1299426542b5b4755e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521F 39596 bytes
font_01_sfnt_off0000a5ab.bin
f2cf83b19d62747b9927f27225ef862fd2b33bbed174865ee336c99f0800bb4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5AB 18648 bytes

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