Malicious PDF — malware analysis report

Static analysis result for SHA-256 90817952ae19eb5e…

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 01:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 536e41ab8da0b3d4276df99dc78826e0 SHA-1: 6aff79c0ace2e5497a60b8beeb2c1f6407cf3f1f SHA-256: 90817952ae19eb5e2a6f7ffe3c50fc40e8e662d8d47e7d2f9b082de9dd385929
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous external links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=process+walk+interview+sheet'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of many links, including to potentially benign Shopify domains, indicates a strategy to obscure the malicious destination and potentially leverage search engine optimization techniques to distribute the malicious PDF.

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=process+walk+interview+sheet
    • http://files.fromearthtoskillet.com/uploads/1/3/1/1/131164198/2868105.pdf
    • http://jegum.nashvilleburnbootcampclub.com/uploads/1/3/1/6/131637814/1841168.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/17968743834.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/piwixuvaloz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4603/3818/files/81508310654.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/28580415911.pdf
    • https://cdn.shopify.com/s/files/1/0434/8500/3926/files/ejercicios_para_el_abdomen.pdf
    • https://cdn.shopify.com/s/files/1/0454/8358/9782/files/microsoft_certified_bi_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8134/files/b._ed_result_2020_hpu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/rozexapofoduwafizowiwifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/73569010903.pdf
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/64270491217.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_off00005c1b.bin
8d8b41c170ef9bea0882f037088fa259c39187526e918823c7fc88ca4c65dca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1B 5104 bytes
font_01_sfnt_off00006d7e.bin
13fb436ef67676231b7aa50f5656001c1397f598a755b2282f61375e470cd69b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7E 10328 bytes

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