Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeae8ca1c36adf93…

MALICIOUS

PDF

46.1 KB Created: 2021-05-14 06:00:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6296c642ae57a4cc30657c278db4cc80 SHA-1: 9d588d8943e87c5871dcb00339a568e0ad781673 SHA-256: eeae8ca1c36adf9365fdcb57ef03fb2448225897be5dcda4893e5eb9f7495988
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a lure for users to download malicious content. The ML classifier also flagged this PDF as malicious. The presence of external URIs and a link farm indicates an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/431946152/free-robux-2021-no-human-verification-game-hack
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/free-robux-without-doing-anything_GM431946152.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/coin-master-hack-apk_GM406889139.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/coin-master-hack-unlimited-spins-game-download_GM406889139.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/how-do-you-install-minecraft-for-free_GM479516143.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/client-minecraft_GM479516143.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/coin-master-pet-food-hack_GM406889139.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/win-free-robux_GM431946152.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/classic-minecraft-net-hacks_GM479516143.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/free-coin-master-coins_GM406889139.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/codes-to-get-free-robux_GM431946152.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/free-minecraft-printables-food-labels_GM479516143.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/flip-master-free-coins_GM406889139.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/minecraft-java-hacks_GM479516143.pdf
    • https://aphb.or.id/new/public/ckfinder/userfiles/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047da.bin
3722fff4e82c4d1dc00ef21e69b9551f338b15eb02de61102627ad5ea1c1c611		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DA 25956 bytes
font_01_sfnt_off0000849b.bin
fba89684ddcf0f72d8c56fed9a3724b59478e28eb92bc452d0547b70cc25d4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x849B 2924 bytes
font_02_sfnt_off00008ec4.bin
a5b009a33d06eb91b5687aca452054299973906144ac3f9b2fc2dd0e2fef1dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC4 19260 bytes

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