Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bdec220833cd9a…

MALICIOUS

PDF

44.2 KB Created: 2021-05-14 14:42:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b8511c595d2f224b103590a2f4626128 SHA-1: 5073afb778303110f534348f9624b5e2b0f11ac6 SHA-256: a5bdec220833cd9af904905d2cf59d7682b4e4beb229a9f5b0d5606e0e9e44bb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to game-related hack or cheat pages. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a lure-based attack. The document's content and structure indicate an attempt to trick users into clicking links that likely lead to malware downloads.

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 https://netcdn.xyz/app/406889139/coin-master-play-online-free-game-hack
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/coin-master-hack-version-download-2021_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/how-to-get-roebucks-in-roblox_GM431946152.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/easy-robux-today_GM431946152.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/mosttechs-coin-master-free-spins_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-robux-by-watching-ads_GM431946152.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/minecraft-apk-114_GM479516143.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/get-free-robux-without-human-verification_GM431946152.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/500-free-coin-master-spins_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/rbx-gg-free-robux_GM431946152.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/coin-master-unlimited-spin-apk-free-download_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-coin-master-androd-cheats-2021_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/coin-master-connection-lost_GM406889139.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/minecraft-java-edition-free-code_GM479516143.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/robuxglobalcom_GM431946152.pdf
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/how-to-get-free-skins-in-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a00.bin
2bdd6aa540778f792f721a3defef09ec1202a16397cc5f959afe88b4b7b59003		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A00 29188 bytes
font_01_sfnt_off00008b5a.bin
72f8f7809eb4a1b9c73a82838ab37455291baaf1e92adfc73e6524a5848e4fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5A 18116 bytes

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