Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ca85c2065e0beb…

MALICIOUS

PDF

54.3 KB Created: 2020-08-14 01:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 857695e48537ba08691131a2ddb7e2b3 SHA-1: 2b3a8a53bd7ab5ff8b8bb1e373ebd3c1049f2c8d SHA-256: a9ca85c2065e0beb45a177e311fee936187121a5ef329e1ff60b6419530b63a3
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Adblock plus free'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload.

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.com/pify?keyword=adblock+plus+free
    • http://pafine.texasmonkeybusiness.com/uploads/1/3/1/4/131483025/2409324.pdf
    • http://patepona.rubyslipperfund.com/uploads/1/3/1/1/131164159/motoguxejes.pdf
    • http://kuvid.newriverartandfiber.com/uploads/1/3/1/3/131383791/nobodegitez.pdf
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/16768375370.pdf
    • https://cdn.shopify.com/s/files/1/0441/4518/0824/files/astm_a240_type_304.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/fukuzodidojidulaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/ie11_acrobat_reader_dc.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/7156938327.pdf
    • https://cdn.shopify.com/s/files/1/0450/3057/2190/files/48408479605.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/salelixakibikiziz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/nuzivejavoni.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0053/files/certificado_de_origen_estados_unidos.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/enterprise_application_architecture_patterns.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_off000095d3.bin
9282fb256530169c821704b2abb2a160114a2a46e2f8d28d87340c8a1e6b18cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D3 5132 bytes
font_01_sfnt_off0000a759.bin
4cd60903abe337ce998ba2ece84601ad334d767145599f7780439024b68913d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA759 10900 bytes

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