Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b6d82f37bfcf7d…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 15:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a9ff5adc2ef37efecbca03eeafad114 SHA-1: 91e193959759ba2ce7ab27305f3141d7ffd0d6f6 SHA-256: 45b6d82f37bfcf7d3239f56d2878c8b49715eb0a06c34098df3c4cca0be9d838
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 pointing to external PDF files hosted on static.usrfiles.com, forming a link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=mellanie+monroe+hogtied', is flagged as a malicious redirector. The document body contains garbled text but includes the same URL, suggesting it's the intended lure. The presence of a link farm and a malicious redirector indicates an attempt to manipulate search results or redirect users to malicious content.

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=mellanie+monroe+hogtied
    • https://static.usrfiles.com/ugd/b8c837_af6b54b025fe416da52ec83a393ae1ad.pdf
    • https://static.usrfiles.com/ugd/9757e7_1b71a8e9e47d4a82b600609180fb1083.pdf
    • https://static.usrfiles.com/ugd/10e3af_3468a726783d4ff9a28aa58564aee6ee.pdf
    • https://static.usrfiles.com/ugd/8b2c09_18e78721391e426396d4a22bb8158dbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e925401a5154aba8108cc0fbf1d2b9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e1947b7e04447b99c3da2920385052d.pdf
    • https://static.usrfiles.com/ugd/824332_5902b0d6d3434182ab0c6b1163e4b8c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7318f5f86d74ce6b90b071dcefc3fb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd3b8e362a2e4060896fd3ae632f73cd.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/32080443649.pdf
    • https://cdn.shopify.com/s/files/1/0454/3918/9142/files/35879370939.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4081/files/different_types_of_astrology_charts.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/neoplasia_prostatica.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42257023754.pdf
    • https://cdn.shopify.com/s/files/1/0447/9582/2240/files/bourdieu_language_and_symbolic_power.pdf
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/affinity_photo_tutorial_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/fikekeru.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/vadojamoribo.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_off0000601c.bin
c532ad01cdb213d1bf92888365816af27c169a8a0451abe129349698a3da7871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601C 5064 bytes
font_01_sfnt_off00007122.bin
5cf87aa8160df65fc6784997bcb71cdd7de1fcea0a90eb06e36841878c75930d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7122 9936 bytes

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