Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bec24aafb87f3e5…

MALICIOUS

PDF

37.3 KB Created: 2021-07-06 04:07:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 513b51e21f10c43a7468592c947de70f SHA-1: 80738d346619799f54b1b674adb7767b6dd3791a SHA-256: 4bec24aafb87f3e53c5e07b31bfd29c28ac20fab13f0f43f828fc209d6b79fdc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF slugs, suggesting a link farm or content-loading mechanism. The primary URL, http://netcdn.tw/app/406889139/free-game-pack-with-google-play-coin-master-game-hack, indicates a lure for potentially malicious downloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-game-pack-with-google-play-coin-master-game-hack PDF link annotation
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/murder-island-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-pokemon-t-shirts-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/hack-in-counter-blox-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/earn-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/como-hackear-roblox-2021-espaol_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/ho-to-get-min-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-daily-free-spin-app_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_002_off0000388b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x388B 23256 bytes
SHA-256: be12f34c11fd13e3a76ba71e8c91fcf2ecbfc9e3f7c29e6f3419b4476ed970b7
font_01_sfnt_off00006cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 19200 bytes
SHA-256: e4d408b22f093965d0c9139718e3ddc1d82d6c802d3d202cf78b1d5fc7aeb7b4

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