Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90eca3e348b233f…

MALICIOUS

PDF

47.8 KB Created: 2021-05-17 09:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 55a8aa80ee79a5491a55ac0a593987a5 SHA-1: 7e98a7acecfa27133b90a04f737fee1b2f7b8a71 SHA-256: a90eca3e348b233fde7d18b3c1acc893e107f5e1965be51701fc94c57164428c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links to external PDF files, presented as a lure for free in-game currency. The ML classifier and the PDF link farm heuristic strongly indicate malicious intent. The document's purpose appears to be directing users to download further malicious content, likely to exploit vulnerabilities or deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/406889139/how-to-get-free-daily-spins-on-coin-master-game-hack
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/robux-hack-me_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/roblox-play-now-for-free_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/easy-points-gg_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/today-free-spin-coin-master_GM406889139.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/best-free-spins-for-coin-master_GM406889139.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/free-spins-coin-master-blogspot_GM406889139.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/free-appsfor-coin-master-daily-rewards_GM406889139.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/free-outfits-roblox_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/free-robux-wheel_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/www-coin-master-hack-xyz_GM406889139.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-twitter_GM406889139.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/what-is-a-minecraft-client_GM479516143.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/is-free-robux-real_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/coin-master-free-spin-links-december-30-2021_GM406889139.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/free-robux-without-downloading-anything_GM431946152.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/how-do-you-hack-minecraft_GM479516143.pdf
    • http://elearning.mtsmutanjungpinang.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004f43.bin
93f9a85e9e1a5ec93c9891d4814b733e0b6db74ea266f8505e2c0e3866c937c2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F43 26112 bytes
font_01_sfnt_off00008ab1.bin
28810b836843d71500948728ec893d4861d8e8ec34d0bab89a16da208a599db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB1 3728 bytes
font_02_sfnt_off000097cb.bin
16a7f242fb8c09a8aee24ffe7eff7301392850b549ae588808710575930a759c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CB 18472 bytes

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