Malicious PDF — malware analysis report

Static analysis result for SHA-256 4579a2d3b58be33c…

MALICIOUS

PDF

44.3 KB Created: 2021-06-04 04:09:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 919685d1d349da5b64074efdceee312b SHA-1: 38dc97b81715a1753f8a96de9303d824fdcb6853 SHA-256: 4579a2d3b58be33cb0fe3ac8ecbbbf70ee3ce51f6eb28fa0f86c0276f80d6ac7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are SEO-optimized PDFs related to game hacks and free spins, suggesting a lure for users seeking cheats. The presence of a download button lure and the password-protected archive lure heuristic indicates an attempt to trick users into downloading and potentially decrypting a malicious payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/coin-master-hack-without-root-game-hack PDF link annotation
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-offer-wall_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_004_off00004fcf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FCF 26032 bytes
SHA-256: 48a0e78e7c2f658c94519c9c82d333b23cffdb144e86a16aa7cf943de7e06eaa
font_01_sfnt_off00008ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB6 18220 bytes
SHA-256: 362aa068b196d4519c7cab909f91a3673cdf28c2147f03b6d737df4b2e6e708c

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