Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fac16ddc0ceba5…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 23:37:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cd44204777ea2d73752d1d39393baab7 SHA-1: cbd8313a3187c32c00f24f0d256ae7115d3178ed SHA-256: 19fac16ddc0ceba55635440ec8f38452bd338762a0d0683ca31e4ec3465aef26
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body that promotes free in-game currency and hacks for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs points towards a potential download lure. No scripts were extracted from this sample.

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.tw/app/431946152/robloxmatchcom-free-robux-game-hack
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-downgrade-minecraft-pe_GM479516143.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coins-master-hacks_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-daily-free-spins-hack_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-get-free-robux-codes_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/is-minecraft-free-on-computer_GM479516143.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/robux-hack-2021-no-survey_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-how-to-equip-your-free-wings_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-get-free-roblox-items_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/is-pokemon-go-fest-free_GM1094591345.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/minecraft-windows-10-edition-free_GM479516143.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-tiktok-likes-no-survey_GM835599320.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/minecraft-for-chromebook-free_GM479516143.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/classic-minecraft-net-hacks_GM479516143.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/pokemon-go-free-90-fps_GM1094591345.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-password-hacker_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-server-hack_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-really-hack-coin-master_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-hack-2021-get-free-robux-for-android-and-ios_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e39.bin
f1383ef7c51e8a4c347ca2a8fa871d4fbe38d534ecd687261b93b9a8abe38077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E39 21908 bytes
font_01_sfnt_off00005eae.bin
0d578fc51ad0f188a9c4505a85014dba64e81475c3b1c73d40a415d6db3d1745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAE 19320 bytes

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