Malicious PDF — malware analysis report

Static analysis result for SHA-256 921cb479869d62cd…

MALICIOUS

PDF

47.4 KB Created: 2021-06-10 17:19:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 74a27ce713ca6c3c4896f30799c0d39c SHA-1: f2058ed059a8c126533e58708d0fdcd84f6962d3 SHA-256: 921cb479869d62cd0b001e2dd64c6f1a6edeaf9e822aa04dd41ec4051892c919
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a prominent external URI, all pointing to websites that promise game hacks and cheats. This suggests a lure to download potentially malicious content or engage in phishing. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a large number of external links, consistent with SEO poisoning or link farms designed to distribute malware.

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.tw/app/431946152/how-to-get-free-cotton-candy-roblox-mm2-game-hack
    • http://mansatupati.my.id/__statics/gudangsoal/files/daily-spin_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/como-hackear-coin-master-2021-espaol_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/how-to-hack-roblox-with-command-promp_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-facebook-free-spins_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/pubg-uc-usd_GM1330123889.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-free-spin-27_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-spin-cheat_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/extra-free-spins-for-coin-master_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/roblox-hacked-version_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/roblox-free-bundles_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/minecraft-pocket-edition-free-download_GM479516143.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-hacks-for-android_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-free-spins-link-download-apk_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/fake-gps-for-pokemon-go-free_GM1094591345.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coinmaster-fan-page_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/i-want-free-robux_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-firebird-card-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f39.bin
ea798daf9eed4232d2f01553dc6a45668862c1ee10c7aa55c6ef9a6d8f443238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F39 26132 bytes
font_01_sfnt_off0000894d.bin
106de1d187d148d03f5c34a802444a7e62d93662ddf359d17cd55770c6c16081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894D 2880 bytes
font_02_sfnt_off0000933e.bin
478b93c502fe1f4a360d232bc15bc4f10d30718f8c6fb8aea2256f63cbc1f097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933E 19376 bytes

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