Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e9b84ae3032eab…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 10:05:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 475a9458e4d086be7c26e0e063b5fb4b SHA-1: c140ce88ee11e3ff117b4b3f85dd941eb03d4897 SHA-256: c5e9b84ae3032eab47d494627af6df891c197c5f8f88b82856f95ab1f5d136c4
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external PDF files, many of which are hosted on a compromised website (ksmt.edu.np) and appear to be SEO spam for game hacks. One embedded URI points to a malicious executable disguised as a game hack. The document's content and structure strongly suggest it's a lure to download further malicious content, likely leading to malware execution.

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.online/app/406889139/coinmaster-game-hack
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/roblox-hacks-2021_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/hack-coin-master-free-spins_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-hack-2021_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-spin-and-coin-links_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/hack-xp-net-generators-coin-master_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/hacks-to-get-free-robux_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/games-for-robux_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-spin-hack-apk_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-hacks-android_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-2021-robux_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/minecraft-bedrock-free_GM479516143.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-hack-mod-apk-2021_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-spin-free_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-no-verification-2021_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-claim-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005201.bin
aa9deeec240d2821523ff9a6503421b16edff351bc2bb076496b0d0000f4c66f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5201 25676 bytes
font_01_sfnt_off00008c17.bin
af208cdb45bd073d7b5ba90b2b5d7fe18c625e7bd90d48e59b2ee82d337b8146
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C17 17808 bytes