Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb1d8e9d95f1278…

MALICIOUS

PDF

34.2 KB Created: 2021-07-10 02:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8e7ed9b412cd1b1509958d118a449727 SHA-1: 7321272501bd55c2c9d5c22c90376ad913c93a42 SHA-256: 9bb1d8e9d95f1278621fec02fa908eba6d4a0a682f72bb9fe87c02fd5c6a2808
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including an ML classifier and a link farm detector. It contains numerous embedded URLs, including one pointing to 'netcdn.tw', which likely serves as a download host for a secondary payload. The document body and embedded links suggest a lure for free Robux or game cheats, a common tactic for distributing malware. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of a download or redirection attempt.

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/free-robux-games-on-roblox-game-hack
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-minecraft-shaders_GM479516143.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-promo-codes-for-roblox-jailbreak-2021-august_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/bloxpink-free-robux_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/roblox-bloxburg-hack-script_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-get-more-robux_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-rare-cards_GM406889139.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/roblox-building-hacks_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/minecraft-pocket-edition-free-download_GM479516143.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/roblox-free-accessories_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-roblox-app_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/cheats-for-big-paintball-roblox_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-make-a-minecraft-client_GM479516143.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-hack-no-verification_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-hack-dayz-roblox_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/hack-coin-master-game-apk-download_GM406889139.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-images_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/counter-blox-roblox-offensive-hacks-wall-hacks_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030c0.bin
2e52a19c0132db2de6b82cf3710226d9facde69daed4cb4fe3401b753037103b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30C0 21744 bytes
font_01_sfnt_off000060c0.bin
56f4e65812c403ac511da7c683eb66c8172328fd08918d47063ad90a487708b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C0 19052 bytes

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