Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47da3240e3bd6a6…

MALICIOUS

PDF

43.1 KB Created: 2021-05-13 01:05:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0548d868f1fda02a1b55c7d0b50080bc SHA-1: 3f2db6a76812961faee2ca948d37ee094a65ca83 SHA-256: d47da3240e3bd6a69d07da8ebceb9f2adeb4fafd48d323ea0e119fa9d1ab87c3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which point to external resources related to free game items like 'Robux'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-generator-2021-no-survey-game-hack, which is likely a lure for a scam or malware download. No scripts were extracted, but the document structure and embedded links strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-generator-2021-no-survey-game-hack
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spin-and-coin-blogspot_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-xbox-360-free-download-code_GM479516143.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-games-with-free-radio_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/create-minecraft-server-free_GM479516143.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-adopt-me-hack_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-play-now-for-free_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-coin-master-card-free_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-spins_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spin-appscoin-master_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-no-human-verification_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-scam_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b4f.bin
2c550c2d78998212fbca990b398c3144e1f50459ac7858112adac00d22257c26		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B4F 24500 bytes
font_01_sfnt_off000083c0.bin
6a3befe032ce85dfab02daa9542f37d979e32cd852f1a969db8cf02301732b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C0 19044 bytes

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