Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c1c33c6c5d1e1a…

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 07:19:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 91a5af76bbc58b3d1d0e65027be655f2 SHA-1: 0859ab48ac5fff798d2e85918d1c1111e22daced SHA-256: 88c1c33c6c5d1e1a48cebe2796245a5ef3ab44eb0fd8d08b57304fca265026f0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a specific external URI pointing to content related to free game items and hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users searching for such content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/431946152/how-to-make-a-group-on-roblox-for-free-game-hack
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-card_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-sites-that-work_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/apk-coin-master-hack_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-spin-link-hack_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/minecraft-mojang-free_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/today-coin-master-free-coins-link_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-apocalypse-rising-hack_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-apps-that-work_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-facebook_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-do-you-get-roebucks-for-free_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-offers_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-duplicate-coin-master-spin-hack_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/live-roblox-bubble-gum-simulator-hack_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-use-hacks-on-roblox-pet-sim-2_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/tiktok-free-videos_GM835599320.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-15-free-spin-link-today_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/best-roblox-free-roblox-avatar_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000523e.bin
7a59566c63a6f0d1eae3d6cf1246a621b22474c6086aeddfefd14682f85829ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x523E 25260 bytes
font_01_sfnt_off00008b18.bin
d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B18 2844 bytes
font_02_sfnt_off000094d7.bin
618aa5fa104ea73151876125e2b85ad7dcdc11323aacc6b5e0056594e37eb48c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94D7 19020 bytes

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