Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9340ab60b8556bf…

MALICIOUS

PDF

47.9 KB Created: 2021-06-08 12:10:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f688c77b39d3811001c8178d16120c95 SHA-1: 23bcbb1033c9af775fb24640514dbe88c696f70b SHA-256: b9340ab60b8556bf5fd956477c9c686da777ff2588274ff9018a323f3a3fe425
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are part of a link farm designed to attract users with promises of free in-game items and cheats for popular games like Roblox and Coin Master. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure further supports a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/roblox-free-robux-just-give-me-your-password-game-hack
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/good-free-minecraft-server-hosting_GM479516143.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-only_GM406889139.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/blox-pink-robux-free_GM431946152.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/como-hackear-coin-master-gratis_GM406889139.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/wurst-client-download_GM479516143.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-required_GM431946152.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-spin-link-free-download_GM406889139.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/free-minecraft-alt-generator_GM479516143.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/open-coin-master_GM406889139.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-download_GM406889139.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/minecraft-auto-miner-hack_GM479516143.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/give-me-robux-now_GM431946152.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdf
    • https://rsudmangusada.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-cards-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005387.bin
0bba402766d66d43387feaaa30df4519d6d824ad61a3b390727afaf8860a70e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5387 28420 bytes
font_01_sfnt_off000094fa.bin
1af8f1b59ccb9086a0a1d41e536db960cc6577e011c809948d10296122f575ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94FA 19672 bytes

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