Malicious PDF — malware analysis report

Static analysis result for SHA-256 b231d572eb5be249…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 16:33:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fb4c60bcded5029147356595a31f86fb SHA-1: d36d0ff0b8d42c01ffbb2e9e8b3d7a879c812168 SHA-256: b231d572eb5be249471287da4d0cc3a1e0009255dd738f63ba628e934a65afca
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are part of a link farm designed to appear as legitimate content. One prominent URL, 'https://netcdn.online/app/835599320/free-tiktok-followers-without-survey-game-hack', is flagged as malicious and likely serves as a lure for users seeking free in-game items or followers. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/835599320/free-tiktok-followers-without-survey-game-hack
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-accessories-roblox_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/no-scam-free-robux_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-cheat_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-that-really_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-followers-and-likes-on-tiktok_GM835599320.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/install-coin-master_GM406889139.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-free-robux-generator_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-robux-on-roblox_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/easy-robux-generator_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-spins-daily_GM406889139.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-windows-10-hacks_GM479516143.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/websites-to-get-free-robux_GM431946152.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/best-free-minecraft-skins_GM479516143.pdf
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-play-no-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000534f.bin
93429db5d47ec2b08da9bcee2cca4e384b7c80c96aefc6e78bb506eba92a082b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x534F 26572 bytes
font_01_sfnt_off00008fbe.bin
972c5a70dc749ce35053117f722bbed941df8334d0eeada4bf476963a288ca46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBE 18492 bytes

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