Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c47961d159ff97c…

MALICIOUS

PDF

37.1 KB Created: 2020-08-06 17:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81dc1346b2d68609f005db7be7c4069f SHA-1: 5c698859e094fcd8431979dfe37c6981434fc5be SHA-256: 4c47961d159ff97ce9d4d022790e6013d38418b93a0f52f8f961eace4f94b83a
120 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of many Shopify-hosted links, some with numeric slugs, further indicates a link farm designed to manipulate search engine results.

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=holmes+introduction+to+sociolinguistics+pdf
    • http://files.europlast-okna.pl/uploads/1/3/1/3/131379904/1047465.pdf
    • http://files.linhr.com/uploads/1/3/1/0/131070189/tabotusatoboza.pdf
    • http://files.brothersinthewild.com/uploads/1/3/0/9/130969543/73c184c8f8063.pdf
    • http://files.marksoftime.com/uploads/1/3/0/7/130775795/dunubo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/43860148147.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/rolinererepobod.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/zesuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3756/files/php_port_scanner.pdf
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/dusov.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/mitalakuxonazijofogupo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/48625514920.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/33031270637.pdf
    • https://cdn.shopify.com/s/files/1/0428/7204/5734/files/99_range_guide_osrs.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_off00005379.bin
5e1b88192008a05f7b228fd1ad378fc2449cae92c39d75b37bf46fac40ee3974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5379 5224 bytes
font_01_sfnt_off0000652d.bin
18a6bd218adc9b6cd5074696619b644f66d7f1ba7cb8878d99932a95b1dff336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652D 10060 bytes

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