Malicious PDF — malware analysis report

Static analysis result for SHA-256 b643ce161ed8afaa…

MALICIOUS

PDF

45.8 KB Created: 2021-06-08 10:49:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 50bd8c89941a3c7546ca51983ef44c23 SHA-1: 8e8c114fbffadc88eefc6d6ea6278242f6fa3202 SHA-256: b643ce161ed8afaa6c391766097e4e748c505d74a29c0b04eb5653cbed9cedf9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external websites. The document body text, though garbled, suggests a lure related to online games and free items, aligning with common phishing or SEO spam tactics. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of this file.

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.tw/app/431946152/games-on-roblox-where-you-win-a-free-rixe-game-hack PDF link annotation
    • http://opac.salatigakota.go.id/slims7//repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/how-to-become-famous-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/robux-cheat_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/object-demonius-free-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatigakota.go.id/slims7//repository/get-free-lives-on-coin-master_GM406889139.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_004_off000052cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CC 25784 bytes
SHA-256: 16bb018aae770057a823c577f9f3f2a3c30f58e089c55175d677059a0a4748e8
font_01_sfnt_off00008dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEC 19224 bytes
SHA-256: 3ffd1c2973867c83561cdb3dd3fa6e7df62f545edd99f7a08c70fcdae57a5aa8

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