Malicious PDF — malware analysis report

Static analysis result for SHA-256 84126bc2e051bd7a…

MALICIOUS

PDF

43.1 KB Created: 2020-08-15 16:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15b7990470c27bd211208dab9a8e687c SHA-1: a862804da234fb8f4b69393ebe5074cef91bfc74 SHA-256: 84126bc2e051bd7abb6827d39ff1435f34eab14fd41afe0d6586884f56740de4
128 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 a link farm hosted on cdn.shopify.com, and one critical link to ttraff.ru which is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URLs, suggesting a deliberate attempt to lure users to malicious sites by posing as a resource for 'architecture portfolio samples'. The presence of a visual download button heuristic further supports the lure-based attack pattern.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=architecture+portfolio+samples+free
    • http://files.colourdance.net/uploads/1/3/1/3/131398125/movus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/buvotusisewelikobegofug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20675343362.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/jazezubowojuzixuto.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/atrahasis_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0437/7290/3585/files/38424669543.pdf
    • https://cdn.shopify.com/s/files/1/0428/5199/1719/files/75540141447.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/verenexopa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4995/8046/files/97313191925.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7799/files/nuzomuv.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_off00006d5d.bin
6b3ebae0a9a801e2c3ff6aff0c7ed515be2e0b5a16169c01f82fc7be959a669b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5D 5244 bytes
font_01_sfnt_off00007f08.bin
744dc39f31c6585e8f363fd05be7c4d2061476a8ab1a1ec39d3fb678779aa737		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 9712 bytes

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