Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0725e51fdbe61e8…

MALICIOUS

PDF

35.0 KB Created: 2021-06-20 16:53:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 72335204a841df30db8faca8858af3f8 SHA-1: e2515aa34dde7544e377f7b2eb312c14fa63b02b SHA-256: a0725e51fdbe61e8535a625817e2fbd97d7d55921cf0d8863a5ca2a92445debb
102 Risk Score

Malware Insights

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

The PDF document contains a prominent call-to-action and embedded URLs related to obtaining free in-game currency for popular games, which is a common lure for malicious downloads. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are likely part of a link farm designed to attract users searching for cheats or hacks. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/easy-way-to-get-free-robux-game-hack
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/cone-master_GM406889139.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-com-free-play_GM431946152.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-kid-friendly_GM431946152.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/what-happens-if-you-get-suspected-of-cheating-on-roblox_GM431946152.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-bc-for-free-on-roblox-2021_GM431946152.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-cards-hack_GM406889139.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-hacked-com-2021_GM431946152.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-capes-no-mods_GM479516143.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/is-tiktok-free_GM835599320.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-fun-hack_GM431946152.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/pokemon-go-for-free-download_GM1094591345.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-app-apk_GM406889139.pdf
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-game-apk-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fef.bin
89933bd6be5cbe79087f8889911c237262b2c332aeb127da9ac84f487c727ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEF 22844 bytes
font_01_sfnt_off00006338.bin
64e8f018724e62164b0ada1d77f482f882d8547e2dcd2accc6d14ba4748306e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 19196 bytes

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