Malicious PDF — malware analysis report

Static analysis result for SHA-256 c541f74376a2071d…

MALICIOUS

PDF

48.4 KB Created: 2020-08-09 08:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ecfff0fd430c2f51adccdfe8c7c77d4 SHA-1: 9d7ed2869aa628a13565e16dba1c88a86d4b5ab9 SHA-256: c541f74376a2071d82e14b97341326533a3681a62fcf23ae84ee42fa1b276ca4
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm designed to improve search engine rankings for malicious content. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=antibiotics+guidelines+pdf', indicating an attempt to direct users to harmful sites. The document body itself is heavily obfuscated but contains references to the redirector URL and other PDF 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/pify?keyword=antibiotics+guidelines+pdf
    • http://files.stnicholasbuccleuch.org.uk/uploads/1/3/0/8/130813132/1760428.pdf
    • http://files.appalachianaxeworks.com/uploads/1/3/1/8/131871852/damaluvudolanulatape.pdf
    • http://files.gratefuldavecharters.com/uploads/1/3/0/7/130775135/9791504.pdf
    • http://vevazik.natjonesartist.com/uploads/1/3/1/8/131857419/bilemarozazogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/kinokotorepeziri.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/58385894794.pdf
    • https://cdn.shopify.com/s/files/1/0439/2573/3531/files/review_handbook_in_diagnostic_bacteriology_rodriguez.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3567/files/wukadalovitufuno.pdf
    • https://cdn.shopify.com/s/files/1/0451/9329/8071/files/75977939548.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/33299258444.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/auditoria_de_gestion_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/47756553728.pdf
    • https://cdn.shopify.com/s/files/1/0437/7581/9927/files/atlas_item_ids.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/nevegakesob.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/58685095130.pdf
    • https://cdn.shopify.com/s/files/1/0448/1505/7056/files/breves_de_comptoir_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/64423145568.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/26587806436.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_off00008047.bin
a4ccfaba6f31e5907494b76df7a51ec77ada044aac7515357eafd9ed5cf471fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x8047 5148 bytes
font_01_sfnt_off000091de.bin
e3415c51484b9f315085aefafab9ad6d06e6f4bc97d6054c4517f70179e10ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x91DE 10208 bytes