Malicious PDF — malware analysis report

Static analysis result for SHA-256 5165ebe0c4c92246…

MALICIOUS

PDF

52.0 KB Created: 2020-08-31 03:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 870a72f75926b316b45d09edc3d7f3a0 SHA-1: d167f3cda58c586a8848e3692aa6c59b42eb1e8f SHA-256: 5165ebe0c4c92246f9b0eb4eba59bee582f72ddd0149c486a8ab9e572ae3549f
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a high number of embedded links, a technique often used in SEO link farms to artificially boost search engine rankings. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=que+es+logica+difusa', is flagged as a known malicious redirector. The document body contains garbled text but includes the same URL and several Shopify-hosted PDF links, reinforcing the link farm hypothesis. No scripts were extracted, and the primary malicious activity appears to be the manipulation of search results through a large number of external links.

Heuristics 3

  • 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.
  • 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=que+es+logica+difusa
    • https://cdn.shopify.com/s/files/1/0460/0699/3057/files/15597565083.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/61877134467.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1453/files/round_to_2_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0440/3996/2774/files/72949618989.pdf
    • https://cdn.shopify.com/s/files/1/0440/0332/8150/files/3652038012.pdf
    • https://cdn.shopify.com/s/files/1/0434/7327/2998/files/63181558936.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/kusodavokizes.pdf
    • https://cdn.shopify.com/s/files/1/0449/1198/4795/files/43250774911.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/95272329394.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/64923350266.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_d5acae17fa314d9b927efabb7631c2af.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_22ff81a5f7214e90a1e4ada3cc011ca3.pdf
    • https://static.usrfiles.com/ugd/1f2646_b3dec61988434650bd2d64951971049c.pdf
    • https://static.usrfiles.com/ugd/8b2c09_54353e294ebc4b6b98696a0163e42d7b.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_off0000846e.bin
d5966886769c276c3fdcab1e9e9ab1f48c206ce843d15b1816dd97b56f046a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x846E 5152 bytes
font_01_sfnt_off0000960b.bin
606e6b47c7bf8250f131cef7ce7d63deece462811db345d682d835c4fc425dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x960B 14172 bytes

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