Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc20358085004bf…

MALICIOUS

PDF

39.0 KB Created: 2020-08-19 09:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c51e24857606de085e072678cb875bb SHA-1: ae4070f2373adfd72bc07455b27971c9fc60b3ea SHA-256: 7fc20358085004bf8b7f707009b5a1e7f081a12e6e0fc5ae53fc4c1f560c615e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=dividing+with+decimals+in+the+divisor+worksheets', is designed to redirect users to malicious content. The document also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, some of which are hosted on Shopify. The primary malicious link is the most critical IOC.

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/pify?keyword=dividing+with+decimals+in+the+divisor+worksheets
    • http://livizorot.piperfayephotography.com/uploads/1/3/1/6/131636725/6594101.pdf
    • https://cdn.shopify.com/s/files/1/0434/5374/3270/files/mano_buddhi_ahankara_chitta_ninaham.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1700/files/70594938096.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/47152632409.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/8678512276.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9201/files/amelie_musical_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4797/files/cyrillic_on_android_tablet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6670/3516/files/faruk.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/37280884884.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/tuzefukurava.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pezudatilekubad.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0475/files/mexul.pdf
    • https://cdn.shopify.com/s/files/1/0438/3011/6509/files/cutaneous_mastocytosis_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/fitukeg.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_off0000582f.bin
d97e1fa1495ea2ccb8504e6696de7ec75e987408b8dd0fb09d5657d007050ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582F 5568 bytes
font_01_sfnt_off00006b01.bin
cd2b096ea159733333862659afd0d166346af9d805b79db1c7b9175383569515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B01 10132 bytes

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