Malicious PDF — malware analysis report

Static analysis result for SHA-256 377404dabb34e797…

MALICIOUS

PDF

35.5 KB Created: 2020-08-29 22:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc0ba27e7dc7959277f71e765a74d300 SHA-1: 913cf39843eefef1ee39dbff6c949080163d8267 SHA-256: 377404dabb34e7974a0f5178a28d1a8a51a6cdaec71c6122b690db671e9a1bdb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.ru/wix?keyword=botw+lake+kilsie+shrine
    • https://static.usrfiles.com/ugd/b8c837_8fbb4db14bcf4200b898f6145b9b1716.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f3032f12afb4c728a9babcad28eb96f.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_6fcc207576624e0a8dc09a2579fb9d60.pdf
    • https://static.usrfiles.com/ugd/913720_93f2eef706574f6b81fc26c8677a988e.pdf
    • https://cdn.shopify.com/s/files/1/0440/8773/8533/files/nogeturiwopezaxovuranadoj.pdf
    • https://static.usrfiles.com/ugd/b8c837_48d132b8992940a8b6dfd096f1126b78.pdf
    • https://static.usrfiles.com/ugd/e73fea_ae1d84405b4c4fe0b9ba47c3c0c44539.pdf
    • https://static.usrfiles.com/ugd/b8c837_dee89e9695fa47e0976269c07d1128aa.pdf
    • https://static.usrfiles.com/ugd/f84671_3c19b8381b80403b99e0d844abcc5cea.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bf0aa6a44964d9e9b467b3dd839b70e.pdf
    • https://static.usrfiles.com/ugd/32acb1_09c79145bab645d8a2c89f453e0d8973.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f1e.bin
40610a9c07bcb3e5b11b75ab4dc6512dcabf378f8a27afc8e44f2ba059884f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1E 4976 bytes
font_01_sfnt_off0000600d.bin
cab578c5fd797635b67064c9b006bf7500daa96020bf0959bd82cff5a11321df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600D 9748 bytes

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