Malicious PDF — malware analysis report

Static analysis result for SHA-256 b689aa4faefce64b…

MALICIOUS

PDF

35.8 KB Created: 2020-09-03 00:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f575d4ef32399a1cc01babec2d6cf64 SHA-1: 6cd2403b6dd7630262d7cc499823a84185825b5c SHA-256: b689aa4faefce64bada90665fc9ea19a0f9a3aae7a3e5c726c571987d197c29a
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 to other PDF files, a technique often used for SEO manipulation or to host malicious content. One of the primary links, 'https://ttraff.ru/wix?keyword=bauer+bodoni+free', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=bauer+bodoni+free
    • https://static.usrfiles.com/ugd/a18aa6_246f58610c4342db92923d27d671ccfc.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_40ce6c984834420a8aabc49d67540abd.pdf
    • https://static.usrfiles.com/ugd/5f4192_4d66f4cffb814cf4921fe5730405b744.pdf
    • https://static.usrfiles.com/ugd/cc207a_74b399c6c90f49d597067c912be23b20.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/kusezoxud.pdf
    • https://cdn.shopify.com/s/files/1/0433/9528/5159/files/merriam_webster_collegiate_dictionary_11th_edition_app.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/equilibrium_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0437/5111/2858/files/lexisozolikiteselokuf.pdf
    • https://static.usrfiles.com/ugd/d2751c_2140a23e970e4d3087ffc6dcfb2e8d7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b80825b543e47e7ae82814e007e50fe.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_off00004f49.bin
ed22900fcee638ed40331c02b0b01cafd93da8053297d20dc5b80812ffeef2d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F49 4880 bytes
font_01_sfnt_off00005ff1.bin
4c3991a51e5ca5a86847f8564b4833234c2a6f11141ba53a55e8b131c0b9e02d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF1 10692 bytes

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