Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45aeaeb4e8841bc…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 06:49:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7ba7a8318d927986b7ed67bcd2ac28d5 SHA-1: c949fe1461ed2b243087d46494c1f05377d4d9ef SHA-256: e45aeaeb4e8841bc45c8ac53783a44470870f0e2c7f68c0162c44b5983c8c7cf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to other PDF files hosted on the 'ntweac.edu.hk' domain. The document body and extracted URLs suggest a lure for free in-game items or currency, likely intended to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to distribute these lures.

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/1094591345/pokemon-go-free-dragonite-game-hack
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-site_GM431946152.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-get-free-clothes-on-roblox_GM431946152.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-spins-coin-master-android_GM406889139.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/master-coin-free-spin-daily_GM406889139.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-no-verification-required_GM431946152.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-fan-page_GM406889139.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-time-speed-hack_GM406889139.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-haktuts_GM406889139.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-2021-free-spins-link-blogspot_GM406889139.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/pokmon-go-free-download-apk_GM1094591345.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/minecraft-free-download-windows-10_GM479516143.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/minecraft-pc-download-free-full-version_GM479516143.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-coin-master-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005212.bin
50a00bfade694adb58d94fb9674261969f7cf6ba0945047875989f8775cfa2f2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5212 24260 bytes
font_01_sfnt_off00008925.bin
d634365b9d9e4054a77f53ca3920b47fed596115b93ff38fed1d70f6403007dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8925 18748 bytes

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