Malicious PDF — malware analysis report

Static analysis result for SHA-256 5426da3b9c9f8152…

MALICIOUS

PDF

32.4 KB Created: 2021-05-14 17:51:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f829a44e6941aae9d5470c1f95d7e0f8 SHA-1: 64fc25d8b4c74971b8d9f4c429889539bfbee56c SHA-256: 5426da3b9c9f8152ad1ca4be79a226d383d23f9c8a5964767d9fe95c7900e9c3
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL and many others appear to be related to game hacks and free currency, suggesting a phishing or scam lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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-heaven-free-spins-link-game-hack
    • http://shiny-nn.ru/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://shiny-nn.ru/images/free-minecraft-shaders_GM479516143.pdf
    • http://shiny-nn.ru/images/free-robux-link_GM431946152.pdf
    • http://shiny-nn.ru/images/how-many-levels-does-coin-master-have_GM406889139.pdf
    • http://shiny-nn.ru/images/apps-to-get-free-robux_GM431946152.pdf
    • http://shiny-nn.ru/images/free-robux-sites-2021_GM431946152.pdf
    • http://shiny-nn.ru/images/coin-master-free-gold-cards_GM406889139.pdf
    • http://shiny-nn.ru/images/coin-master-free-coins-link-march-2021_GM406889139.pdf
    • http://shiny-nn.ru/images/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://shiny-nn.ru/images/roblox-verification_GM431946152.pdf
    • http://shiny-nn.ru/images/free-spin-coin-master-ios_GM406889139.pdf
    • http://shiny-nn.ru/images/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://shiny-nn.ru/images/100-free-spins-coin-master_GM406889139.pdf
    • http://shiny-nn.ru/images/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://shiny-nn.ru/images/free-robux-without-human-verification-real_GM431946152.pdf
    • http://shiny-nn.ru/images/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://shiny-nn.ru/images/free-coin-master-generator_GM406889139.pdf
    • http://shiny-nn.ru/images/coin-master-hack-no-survey_GM406889139.pdf
    • http://shiny-nn.ru/images/coin-master-in-app-purchase-hack_GM406889139.pdf
    • http://shiny-nn.ru/images/free-minecraft-survival-server_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049e2.bin
e2d05937be57782a7b7153a67a312feb759e59243d9cacaca18ddfdb501d1a79		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E2 24808 bytes

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