Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02b28c5f424f5a3…

MALICIOUS

PDF

45.2 KB Created: 2021-06-08 23:33:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3afc49aa55fdf4f520b42ed9a7d62e94 SHA-1: ea8b8904917e74ecdf2b9b4ef7b64e53d718caa1 SHA-256: a02b28c5f424f5a3e8deab19a512973b5a537cdca3567456fa4570484540c419
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a call-to-action phrase, directing users to websites that promise free Robux and game cheats. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm designed to attract traffic or distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML_NYX_PDF_MALICIOUS firing strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/how-to-get-20210-robux-on-roblox-no-hacks-game-hack
    • http://library.ft.upnvj.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/roblox-cheat-engine-no-viruses_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/roblox-a_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdf
    • http://library.ft.upnvj.ac.id/repository/games-that-can-be-hacked_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/op-rewards-free-robux_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/free-spins-for-coin-master_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/coin-master-hack-android_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/coin-master-coin-link_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/how-to-win-free-robux_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/impact-minecraft-hack_GM479516143.pdf
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/hacks-para-roblox_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/free-robux-with-no-verification_GM431946152.pdf
    • http://library.ft.upnvj.ac.id/repository/free-spins-on-coin-master-links-2021_GM406889139.pdf
    • http://library.ft.upnvj.ac.id/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052c1.bin
ec0ba7f87b04ac348b109a58f68cbc89da337a98b8da736540e82044acc213a9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C1 24856 bytes
font_01_sfnt_off00008b91.bin
79c273561043177a762c9bc13d5c128a2a1d579cdd6981976eec9391185537e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B91 18992 bytes

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