Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eccbb1c1c3d2308…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 14:35:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a21cd2ca51ea01fc0850f7410ec1d576 SHA-1: bae5288b39a2bdebe456bab855ab937d407dd163 SHA-256: 6eccbb1c1c3d23082826537b8516ccd060598167105181fbc580f1e660bcb28c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, forming a link farm, and one prominent external URI pointing to a suspicious domain. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URIs and the link farm structure suggests an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/free-spin-codes-coin-master-game-hack
    • http://library.stieyapan.ac.id/repository/minecraft-free-computer-game_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/minecraft-sign-up-free_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/codes-to-get-free-robux_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/free-spins-and-coins-coin-master-app_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • http://library.stieyapan.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/today-free-spin-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/roblox-hacks-2021_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/bloxpink-free-robux_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/minecraft-multiplayer-free_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/rewards-roblox-com_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-free-coins-link-march-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005053.bin
975b72478b3686d53b813d383aa74192ae799051ead5821c21049dd6e8e624d0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5053 25060 bytes
font_01_sfnt_off0000894c.bin
b7fe42cb1da39e96c756399b3532633df029c1fbb3443b9e17d98df25c90dc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894C 3204 bytes
font_02_sfnt_off00009450.bin
2136a1c0602e46c8a246992dca7dcdebcaf9a61ffc19b327be6d600db2c61793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9450 18060 bytes

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