Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa382d7ffab17f4…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 16:10:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 86029376a1d31aaf8a42700e3057ccb4 SHA-1: f496e2df68b40e6565991ee55178ce9ae549a218 SHA-256: cfa382d7ffab17f44e50e1670bfd3a7b22fdb5986d413ec98f8e23d45833e0ff
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are structured as SEO-optimized links pointing to pages promising free in-game currency or hacks. The ML classifier and PDF heuristics strongly indicate malicious intent, likely to direct users to phishing or malware-hosting sites. The document body explicitly mentions 'free Robux' and includes a URL that appears to be the primary lure.

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.co/app/431946152/how-to-gewt-free-robux-on-a-ipad-game-hack
    • http://digilib.ulm.ac.id/pusat/repository/tiktok-viewer-free_GM835599320.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-games-and-to-run-fast_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-star-wars-clothes-on-roblox-games_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/flame-gg-free-robux_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/roblox-how-to-get-free-gears_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-spin-rewards_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-giveaway-live_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/6-ways-to-get-free-robux_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/best-hack-for-coin-master-2021_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-just-enter-username-and-password_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-apk-114-4_GM479516143.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-a-lot-of-robux_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-clothes-roblox_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-online-free-spin_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/roblox-phantom-forces-cheats-2021_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/cheat-roblox-gas-oil-simulator_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/get-robux-in-roblox-free_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-800-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ea7.bin
53d7dd4f527a0156c9016bc6269c3577bea6731b7d8033af4368453400713870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA7 22356 bytes
font_01_sfnt_off0000606f.bin
5dd7908a34c753b34a823dbaee94b9897654a910b2a0214c98d48866b832879d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 19336 bytes

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