Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be35cea4faa5f18…

MALICIOUS

PDF

44.1 KB Created: 2020-08-06 20:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e214521fadd4a5cb450a5f7b132cfcd SHA-1: 56245351af6384f9668188335167e8097e458344 SHA-256: 1be35cea4faa5f181f22b4f66e6cea3fd4810905eed55f7603f22c858dea354a
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO spam and phishing campaigns. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=greatest%20common%20factor%20worksheet%205th%20grade'. The document body, though heavily obfuscated, also contains this URL and references to educational content, suggesting a lure to trick users into clicking the malicious link. The presence of a large number of PDF links, many hosted on Shopify, further indicates a link farm designed to attract traffic.

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.cc/wb?keyword=greatest%20common%20factor%20worksheet%205th%20grade
    • http://files.mylifeonitshead.com/uploads/1/3/1/4/131438348/9609348.pdf
    • http://panomupa.familypracticemidwifery.com/uploads/1/3/1/4/131406717/gatesoduguzavoj.pdf
    • http://files.franucci.com/uploads/1/3/1/4/131452771/fapiteg.pdf
    • http://files.striba.net/uploads/1/3/1/3/131380413/9297027.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/jugewagud.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3767/files/nekepekixaparatun.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0510/files/62508818949.pdf
    • https://cdn.shopify.com/s/files/1/0437/6628/4446/files/73176019305.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/22921606891.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90067119925.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/wuvigikanoredibeput.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/fumubopuxupubumoridegovo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4141/3527/files/31231685834.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/wawaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/74509202567.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/lolidinujemogudezusot.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_off00006d66.bin
0857bb7778c0287f344fe300137b598efacfd5e1555299776a988b1e1930abbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D66 5716 bytes
font_01_sfnt_off000080c9.bin
097675333f1c77af8c6b359187dab8e17381fea9192f2d2f5a3c411c064f9844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C9 10008 bytes

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