Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0566e87520efdb…

MALICIOUS

PDF

113.5 KB Created: 2020-08-25 07:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771299090acea7d438172197e4cf3b54 SHA-1: bf31779d20d14b4832d179ca27f58a2fb3427196 SHA-256: cb0566e87520efdbef48efe9bb3f4666ffc8065c8b9b9cfa45826851a0d0663e
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links, https://ttraff.ru/pify?keyword=c+c+performance+comparison, is flagged as a malicious redirector. The document body itself is heavily obfuscated but appears to contain the same URL. This suggests the primary purpose is to redirect users to malicious infrastructure.

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=c+c+performance+comparison
    • http://wuxujeki.lucernelyme.co.uk/uploads/1/3/0/7/130739783/606020605.pdf
    • https://cdn.shopify.com/s/files/1/0452/0011/3813/files/ronugozuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/nopezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5459/files/posipesugawunupozev.pdf
    • https://cdn.shopify.com/s/files/1/0428/6863/7862/files/fukesamolez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0735/files/44349359184.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3929/files/chair_background_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/1140/5986/files/59375414019.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/4620744821.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_off0001750c.bin
b5c64193a282fbe906d616a650f4a27588defde20c56394918c049ab442cf392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1750C 5036 bytes
font_01_sfnt_off00018609.bin
cb1154c1f7a0ac4fc0d4a4cf98e29f5d54b93795d890eaedf21610373da8821d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18609 16384 bytes

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