Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e3290ce575b41a…

MALICIOUS

PDF

40.9 KB Created: 2020-08-26 10:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 684d72eceedcb25bcbcc40ceb8edc4b8 SHA-1: 81e77d142987d7f72ecab84d860510af9311831b SHA-256: a9e3290ce575b41a52590ccb6b02232bd05dc5240d3576619d138abf14cfb8b1
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 of which point to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests a link farm or SEO poisoning attack designed to funnel users to malicious content.

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.club/pify?keyword=contabilidad+de+sociedades+mercantiles
    • http://files.johndecollibus.com/uploads/1/3/0/9/130969873/nibajub.pdf
    • https://cdn.shopify.com/s/files/1/0438/9981/4056/files/dowejigenalesunigafokil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapiguwidekedod.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/zewamawosiwe.pdf
    • https://cdn.shopify.com/s/files/1/0440/6067/2165/files/11371479507.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/26539210275.pdf
    • https://cdn.shopify.com/s/files/1/0460/0620/6631/files/ethical_issues_in_information_technology_2018.pdf
    • https://cdn.shopify.com/s/files/1/0447/8858/0512/files/porunafokomavomabaxidufad.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/50945247851.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/52102015076.pdf
    • https://cdn.shopify.com/s/files/1/0430/6550/8002/files/witofemoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9696/files/kev_nair_english_fluency.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_off00005ef5.bin
9f1b3dd7e9793b0db8bb5442a6efdbed244fc9f407a77ce2be0a1aa40d8f4bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF5 5128 bytes
font_01_sfnt_off00007047.bin
0564f92017d3a7bb07c0f2e4db69951a50f56cb76156c4912a5c859f331c3c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7047 11364 bytes

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