Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5916517a0bb8864…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee09712300496b6c8bf6ed7f2f63cfcb SHA-1: c64db8409b0c3a98e4de77db4fac27d2e269a047 SHA-256: c5916517a0bb886430b7057c54c898fc079b4e1555f5af87f1b166775e847ce9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.com/wix?keyword=bow+charge+plus+mhw, is flagged as a known malicious redirector. This suggests the document is designed to direct users to malicious infrastructure, likely for phishing or malware distribution.

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.com/wix?keyword=bow+charge+plus+mhw
    • https://static.usrfiles.com/ugd/ade4e6_691dcd6f313c41019a91349ce82e4aeb.pdf
    • https://static.usrfiles.com/ugd/ea2f88_4b7ab7e28aaf49e8a924ae6aee264c03.pdf
    • https://static.usrfiles.com/ugd/b8c837_476e506ee621455a999c44bbb08bdf8b.pdf
    • https://static.usrfiles.com/ugd/fa6f14_c0078e80be3340899b30916f467b96ba.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_9ccd720bd03a466888d15fadbebb549e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ecdb13adb7c4b1888c2f9531758d173.pdf
    • https://static.usrfiles.com/ugd/b8c837_53e8f6c744ad4c91b07e0a08e93016c5.pdf
    • https://static.usrfiles.com/ugd/c1de29_2bae88c3c39f4724ba0b5c05147a9a0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_65753c6de48c4181ab587ea8a8e608a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e07668e1ce740638d2bf153e34a7753.pdf
    • https://static.usrfiles.com/ugd/c1de29_b1e05842bf7e4a7bb166cf94f1feefd5.pdf
    • https://static.usrfiles.com/ugd/de65f7_034dd681a81343e9b2cafb6d9bf32ae9.pdf
    • https://static.usrfiles.com/ugd/e4ff69_7cfc3cb6f22e4d8c8aafdda81d9d69ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa0ba7b175c2460bb63e320da8ee3f53.pdf
    • https://static.usrfiles.com/ugd/b8c837_653fb4ac29404c1193e4fb58151fa8f5.pdf
    • https://static.usrfiles.com/ugd/19103d_1f33f70a79ed423b8d16bdf43a0c6ef8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004df3.bin
45298e907c416216817620678642a3097b9e7232307d23c64bf835486199ca2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF3 5468 bytes
font_01_sfnt_off000060c6.bin
26ab951b4e886a163297f1e6215b9b4d8541bf7ce5f4dc5e859d4ba3ab8ad235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C6 5488 bytes
font_02_sfnt_off0000735f.bin
ac104f5b46ce5e14da1a054618fddcc5ef7ba2b161b4265501dc2d62015b4c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735F 10444 bytes

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