Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a8701ef35ff91b…

MALICIOUS

PDF

35.4 KB Created: 2020-08-29 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56aa3dfe82fbc494c4c72ea8f4acea49 SHA-1: 7a4091043c1117a75096c406ddcddbdfcdc6544c SHA-256: 25a8701ef35ff91b7f15d9001309cb9a574aa87d47bee04149a5547db4fd7020
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=microsoft+basic+render+driver+cs+go', is flagged as a known malicious redirector. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but does not provide clear user-facing content to indicate a specific lure.

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=microsoft+basic+render+driver+cs+go
    • https://cdn.shopify.com/s/files/1/0435/9274/5117/files/71531564772.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/61415764545.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/50736213750.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2732/files/how_to_cite_a_file_in_apa_example.pdf
    • https://static.usrfiles.com/ugd/b8c837_a069e590c199413ba56d35450666b219.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/37754518494.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/seagate_wireless_plus_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/68430338789.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/die_dialektik_der_aufklrung.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/98789666347.pdf
    • https://cdn.shopify.com/s/files/1/0461/9829/2643/files/naxewawiloda.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/nojaputugogusalogoxoni.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_off00004c97.bin
c226d3e7740373f9bb4f0f059a21c9f83b31d73ef6ebb704de63ef1211482be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C97 5360 bytes
font_01_sfnt_off00005eea.bin
5e9bf7092210babe1369b01bcdc70e1b3a59cdf5edda5d207cc72dbef86b9254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEA 9952 bytes

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