Malicious PDF — malware analysis report

Static analysis result for SHA-256 b889c6b11a30c875…

MALICIOUS

PDF

49.0 KB Created: 2021-06-09 13:54:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bbb0908866503180c24a7873ed8b7027 SHA-1: 52cc39324b530ddd1cf04f781813a347714b2f8a SHA-256: b889c6b11a30c875e04cdd6363cb1bc44b0d175e4cd061eb694a9cdc7e7503e8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though partially obfuscated, contains references to 'Roblox' and 'free Robux', indicating a lure for users interested in such topics. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-to-get-epic-face-on-roblox-for-free-game-hack
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-fan-page-facebook_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-codes_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-free-robux-codes_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-easy-and-fast_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-free-edition_GM479516143.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-hack-generator_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-links-app_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-do-you-earn-robux_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-link-today_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/http-coin-master-hack-club_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-im-freaking-out-hack_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-hack-2021_GM431946152.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/100-free-spins-coin-master-link_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://pertanian.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-things-on-roblox_GM431946152.pdf
    • https://robuxhaxs.com
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058a0.bin
a61eee09844593ac03b2c96fa44bf93e5202d009e1ac3458644bdb256df05aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A0 24756 bytes
font_01_sfnt_off000091c6.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C6 2840 bytes
font_02_sfnt_off00009b78.bin
80e813aac4439b11d120a35fb9e8eba2b1b66620b986f393a8b1f8fb0eddc36f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B78 18740 bytes

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