Malicious PDF — malware analysis report

Static analysis result for SHA-256 edef8918a652341a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-22 00:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6d323054370abb20ae280e321ec2026 SHA-1: 0df19bdae627cb3fbb296d3e6c90541e35faa7b1 SHA-256: edef8918a652341a66f1e3ade304eee8aca1190951e23fbb4ba54b11da42a1a3
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, forming a link farm. One of the primary links redirects to a known malicious redirector, ttraff.ru, which is disguised as a vehicle bill of sale. This indicates a social engineering lure designed to lead users to malicious infrastructure. No scripts were extracted, and the document body was heavily obfuscated, but the heuristic firings strongly suggest a malicious redirector and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=vehicle+bill+of+sale+illinois+pdf
    • http://files.azpeorialodge31.org/uploads/1/3/2/7/132740978/9540137.pdf
    • http://files.communitychurchofkeystoneheights.org/uploads/1/3/0/9/130969681/fed8cd07f7.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/gakopadunazibarimexawufi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9901/9682/files/2379693751.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/96098753908.pdf
    • https://cdn.shopify.com/s/files/1/0437/5101/4551/files/84052673418.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/6177225815.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/fenosokejejemixiwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7655/files/ruxegunagabe.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_off00006628.bin
174ac8bf254f75e28759231b817da6d37329bdf4f36d90a05bf28669627fae35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6628 5252 bytes
font_01_sfnt_off000077f5.bin
c8120e487edc35701a172fdef190cd322f687eaedba5b2bf59dad34d9d7c9357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F5 10276 bytes

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