Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30cf704f730d843…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 16:12:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8fe6f3fec90d2b5bc50eb3d48022ae7e SHA-1: 3b3b580787871184ce6e47a613276856e251de2c SHA-256: a30cf704f730d843fcfa20840f335f3a0815d656bef7f39cf4b306778a3fc36f
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a prominent call-to-action related to 'Buy Robux Hack'. The heuristic firings indicate a PDF link farm and a high ML classifier score, strongly suggesting malicious intent. The primary URL http://netcdn.tw/app/431946152/buy-robux-hack-game-hack likely serves as a landing page for a scam or malware distribution.

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.tw/app/431946152/buy-robux-hack-game-hack PDF link annotation
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-by-just-clicking_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-free-fgteev-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-install-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-no-surveys-or-offers_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/v3rmillion-hacks-roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-tiktok-video_GM835599320.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/what-roblox-games-has-no-cheating_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003141.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3141 22832 bytes
SHA-256: 16ebb84f2f86f6655f2702afaa36b2132529f562ad7ec6c51b9079fb3607b922
font_01_sfnt_off00006474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6474 18716 bytes
SHA-256: 2392d2ac057e15d86f7b7aab25930201158f8b67cd5c5393381e2d12c0af7dff

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