Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b3b593438670f8…

MALICIOUS

PDF

41.5 KB Created: 2020-09-01 15:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8511b85c6222fc4d1dac0f2ffa5a9654 SHA-1: 2bd75d7bff42d8979c689219c3464b043c77c784 SHA-256: 90b3b593438670f87743368fd334ce1416c23fc7f28b2fe365ca1e79b66eb7ec
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO poisoning attack. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=angular+formcontrol+select+change'. The document body, though heavily obfuscated, also contains this URL and other PDF links, reinforcing the lure mechanism. No scripts were extracted, but the primary attack pattern is clear: redirecting users through a chain of links to a malicious destination.

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=angular+formcontrol+select+change
    • https://cdn.shopify.com/s/files/1/0433/4115/2406/files/laxobudi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/92428244207.pdf
    • https://cdn.shopify.com/s/files/1/0440/6696/3621/files/14318413260.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/silafuxirozuxekoxipovixe.pdf
    • https://cdn.shopify.com/s/files/1/0464/0243/7275/files/gosoduzumobomuzo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2069/8268/files/28064051359.pdf
    • https://static.usrfiles.com/ugd/eb6612_62eda4d3e3a640169b471c61052d9d14.pdf
    • https://static.usrfiles.com/ugd/0d9a50_8aeb44b56fb74c78a69a3ca0bb023663.pdf
    • https://static.usrfiles.com/ugd/4aae87_760278bc3a0848b3b19e3f878f549e65.pdf
    • https://static.usrfiles.com/ugd/5ecadc_13f99d3744e5460eb813cbc242ad03aa.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_off00005a74.bin
72469543c89fe148508d644615cd81f3fc248581c6ee66de3cdf39b42d504d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A74 5284 bytes
font_01_sfnt_off00006c49.bin
506e45bf40dae5f63d915935e5917c7bd6839c27016a7369c01eae8947c58aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C49 14076 bytes

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