Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7497fdd5686ba3b…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 08:48:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dabb440401222ea2d99c1cca59145359 SHA-1: dcb6d01c321c2324c66c180cb4ed29a8fea40294 SHA-256: c7497fdd5686ba3bb68c28c7edc76b4d894c5e28802c0ae95be2de31607117ca
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which appear to be part of a link farm designed to attract traffic or host malicious content. The ML classifier strongly indicated maliciousness, and the presence of a call-to-action button further supports a deceptive intent. The primary goal appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/todays-free-spin-and-coin-links-game-hack PDF link annotation
    • http://perpustakaan.fk.unila.ac.id/repository/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/earn-robux-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E71 25684 bytes
SHA-256: bc3e2cf429c45ce4d1c029a66f4cc9f58fda47bf0ba059f22fe469a1e1cfe2ab
font_01_sfnt_off00008998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8998 18304 bytes
SHA-256: fe41b9c6f73a07cbbf88dd054bef46cc881cfc19b14a93a0ff48235cedd50557

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