Malicious PDF — malware analysis report

Static analysis result for SHA-256 521b3c4b23363575…

MALICIOUS

PDF

48.6 KB Created: 2020-08-19 13:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fcb60ca19aad2f3eaaebc2ccf176b14 SHA-1: aff6467fa27ea69c65553d1ba918951f84689bb9 SHA-256: 521b3c4b23363575013a10c5b97b83e312d0d968beddb04ddf3f409fa7ac4eee
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=best+platform+bed+frame+wood'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the first identified as 'https://cdn.shopify.com/s/files/1/0433/9286/0327/files/21005568682.pdf'. The document body, though heavily corrupted, contains fragments of the redirector URL and the Shopify URL, suggesting these are the primary lures.

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/pify?keyword=best+platform+bed+frame+wood
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdf
    • http://foxobetus.mdwriter.com/uploads/1/3/1/4/131437462/d48a146e367036.pdf
    • http://files.cypressarbor.com/uploads/1/3/1/6/131637271/8f076ba2239e.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/21005568682.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/puzunuwikopugeponapul.pdf
    • https://cdn.shopify.com/s/files/1/0433/8253/8403/files/55378293975.pdf
    • https://cdn.shopify.com/s/files/1/0432/9144/3364/files/womobabolirutenoduwof.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/6637002893.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/tejotota.pdf
    • https://cdn.shopify.com/s/files/1/0446/5822/9411/files/elna_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/fominukebefusosufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/dawuluzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/32052511092.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/83115738557.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_off00007e71.bin
aab3a8b0596da95697d24a8e6b53df298b5a5db699f9d6d3698f7832beed7b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E71 5468 bytes
font_01_sfnt_off00009100.bin
7511750acf335ad14b2d7fa3230252d6cac807637ac957ec96d497e848678c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9100 10708 bytes

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