Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb11ea36665dca42…

MALICIOUS

PDF

50.2 KB Created: 2021-06-11 11:50:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 66d9c2b6eebe06788cfc8ba9347cbd3f SHA-1: 8c4d6da4ef66bdf885be42197341576b5b3880f2 SHA-256: bb11ea36665dca42736e37da4a5b9ddc5304f713bcc5945d8dc3778ddc2b4150
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which are related to popular online games like Roblox and Coin Master, suggesting a scam or phishing attempt to lure users to potentially malicious sites. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking through to these external resources. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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/huskybux.com-free-robux-game-hack
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/roblox-old-avatar_GM431946152.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-free-spins-cheat-codes_GM406889139.pdf
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/inject-hack-roblox-no-human-verification_GM431946152.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-get-free-robux-fast_GM431946152.pdf
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/free-robux-go-to-guuudd-info_GM431946152.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-drop-master-free_GM406889139.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-free-robux-in-roblox_GM431946152.pdf
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-free-coins-link_GM406889139.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-roblox-groups-with-funds_GM431946152.pdf
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/is-minecraft-education-edition-free_GM479516143.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-free-spin-today_GM406889139.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-hack-someones-account-in-roblox-2021_GM431946152.pdf
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/roblox-hack-dungueon-questcom_GM431946152.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-daily-free-spins-hack_GM406889139.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-hack-com_GM406889139.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/hack-coin-master-app-ios_GM406889139.pdf
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/minecraft-build-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005607.bin
d6667932d3588cd0113b0c84ab0da7abc2619c03e9d11cc8f86c31f49e9da464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5607 26524 bytes
font_01_sfnt_off000094de.bin
d2fbe445e4228ea2e3d75d3e8f0f84124f9dd8d3d0cf2c6e4e63bcca92f2519f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94DE 3512 bytes
font_02_sfnt_off0000a071.bin
9c47c6972ac84d93a6e4947d9ffe5bb52cd13c94fc3c6e7246f14e3cc3dfb495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA071 18688 bytes

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