Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa96f38b7a7447c…

MALICIOUS

PDF

42.5 KB Created: 2021-05-13 21:15:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fd76e2a785cc6269a324c12e144ef11d SHA-1: f2ab705d5e2668ada0693d87214d61a3ad6ff84e SHA-256: 5aa96f38b7a7447c80e8484daf0f0fc2e4c5bdd392372e615abb8d1635227f66
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which appear to be SEO spam or lures for free in-game currency or hacks. The presence of a 'Download button' lure and a 'Password-protected archive handoff' heuristic suggests a potential attempt to trick users into downloading further malicious content or providing credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/431946152/is-roblox-free-on-xbox-game-hack
    • http://library.imz.or.id/repository/coin-master-free-spins-fb-champion_GM406889139.pdf
    • http://library.imz.or.id/repository/25-free-spins-coin-master_GM406889139.pdf
    • http://library.imz.or.id/repository/but-link-says-free-robux_GM431946152.pdf
    • http://library.imz.or.id/repository/coin-master-15-free-spin-link-today_GM406889139.pdf
    • http://library.imz.or.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://library.imz.or.id/repository/how-to-download-minecraft-for-free-ios_GM479516143.pdf
    • http://library.imz.or.id/repository/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdf
    • http://library.imz.or.id/repository/minecraft-diamond-finder-hack_GM479516143.pdf
    • http://library.imz.or.id/repository/moonactive-free-spins-coin-master_GM406889139.pdf
    • http://library.imz.or.id/repository/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdf
    • http://library.imz.or.id/repository/how-to-get-minecraft-java-free_GM479516143.pdf
    • http://library.imz.or.id/repository/is-windows-10-minecraft-free_GM479516143.pdf
    • http://library.imz.or.id/repository/free-roblox-svg_GM431946152.pdf
    • http://library.imz.or.id/repository/coin-master-hack-apk-2021_GM406889139.pdf
    • http://library.imz.or.id/repository/free-robux-pins_GM431946152.pdf
    • http://library.imz.or.id/repository/mcpe-free-download_GM479516143.pdf
    • http://library.imz.or.id/repository/google-coin-master-free-spins_GM406889139.pdf
    • http://library.imz.or.id/repository/codes-to-get-free-robux_GM431946152.pdf
    • http://library.imz.or.id/repository/lazyblocks-com-free-robux_GM431946152.pdf
    • http://library.imz.or.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004be0.bin
1390104318f9f13edc16097060194deee95a66c1a49e15ee84913e2bf551ccbc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE0 25304 bytes
font_01_sfnt_off000084ef.bin
b3ba82aa7ee3d7aa0ce4ddaa3eca5cb497d3e48713e942ef8c08a7410c5f198f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EF 17948 bytes

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