Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6c56dbb1af28ac…

MALICIOUS

PDF

54.1 KB Created: 2021-06-08 17:21:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9d351cc57421b91932d14cca5a0d34d3 SHA-1: e1a697376ad019802347cc2cc0680a8352f40f23 SHA-256: cd6c56dbb1af28ac97d73f3212aa3d87092f4b348ec9024d58d5c304e5bdb8ba
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external resources, many of which are structured as SEO-optimized PDF documents. The primary URL, https://netcdn.tw/app/431946152/how-change-in-roblox-for-free-game-hack, suggests a lure for in-game currency or cheats. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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/how-change-in-roblox-for-free-game-hack
    • http://lib.stimykpn.ac.id/repository/coin-master-code-hack_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdf
    • http://lib.stimykpn.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://lib.stimykpn.ac.id//repository/how-to-pubg-uc-carding_GM1330123889.pdf
    • http://lib.stimykpn.ac.id/repository/games-that-give-free-robux_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/get-free-robux-without-human-verification_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/what-do-roblox-points-do_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/minecraft-pocket-edition-free-download_GM479516143.pdf
    • http://lib.stimykpn.ac.id//repository/coin-master-mod-version-free-download-2021_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • http://lib.stimykpn.ac.id//repository/rbx-free-robux_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/getrobux-info_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/claim-free-robux_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/fb-coin-master_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/minecraft-bedrock-client_GM479516143.pdf
    • http://lib.stimykpn.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdf
    • http://lib.stimykpn.ac.id/repository/minecraft-handbook_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051a4.bin
f8f35561280cfc4dd9d0c6b38ddc531e971fadcfcbb6d19476886616f4ab830e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A4 38968 bytes
font_01_sfnt_off0000a631.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA631 2824 bytes
font_02_sfnt_off0000afe0.bin
2e25bfbf4ab5a4fdb3664b02bfa6cd3806b02c825320415122ab565475369b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 18792 bytes

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