Malicious PDF — malware analysis report

Static analysis result for SHA-256 78843d2fc3f5548c…

MALICIOUS

PDF

49.1 KB Created: 2021-06-04 01:34:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1b9e3703a5d737679e5e92dc438af0e6 SHA-1: 84e11fedd2715caecedbf6433f7b6a4bc5c87f2d SHA-256: 78843d2fc3f5548c4994f69ae7943d17389fca8dfc1cc05f6a6ae2c5e05c1569
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to SEO-optimized PDF files hosted on external domains, suggesting a link farm or redirection scheme. One prominent URL, 'https://netcdn.online/app/431946152/microsoft-bing-free-robux-game-hack', is directly associated with the lure of free Robux. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/microsoft-bing-free-robux-game-hack
    • https://perpustakaan.stiq-amuntai.ac.id/repository/best-free-minecraft-servers_GM479516143.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/coin-master-free-spins-only_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/tiktok-2021-free-download_GM835599320.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-spins-october-28-2021-coin-master_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-robux-without-any-verification_GM431946152.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/coin-master-hack-app-android-download_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-coins-coin-master-daily_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-to-hack-coin-master-using-es-file_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdf
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-spin-coin-master-link-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052d8.bin
7334cb5d033d13ef20cf0edf2d7ed96502fee76f613dccaa8ae9454be2016742		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D8 25956 bytes
font_01_sfnt_off00008f17.bin
64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F17 3884 bytes
font_02_sfnt_off00009bbf.bin
f6da71d3ec7876d1f2450260025b1db4712d77c7886386833aafb50cc2347919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BBF 18720 bytes

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