Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd8ae999d0e9048…

MALICIOUS

PDF

44.3 KB Created: 2020-08-10 11:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff289dc0b66f3bd2440164559d09192a SHA-1: 0ff9b1a31a73c73c21005d64ec6d8cbffdca02da SHA-256: 3fd8ae999d0e90480132614d248447709a17a76b92e57faff32e2bbf40e22251
120 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, masquerading as educational worksheets, to a known malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=year+1+phonics+worksheets+pdf. This technique is commonly used to redirect users to phishing sites or to download further malware. The document body itself is heavily obfuscated but contains references to the malicious URL and benign-looking PDF filenames.

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=year+1+phonics+worksheets+pdf
    • http://files.805farms.com/uploads/1/3/1/4/131437724/2327814.pdf
    • http://files.margauxfashiondesigns.com/uploads/1/3/1/6/131637308/jalijegazot.pdf
    • http://files.tomlinsonandco.com/uploads/1/3/1/4/131438071/tegukawow.pdf
    • http://files.coachtiffkelley.com/uploads/1/3/1/4/131437291/636754e.pdf
    • https://cdn.shopify.com/s/files/1/0437/2214/5943/files/entersandman_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/tanan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/53316614288.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/wodutupukaxonamuxaxode.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9270/files/laruwokezefize.pdf
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/xanar.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/pesetimokomidik.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/98339896563.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_off00006ee6.bin
5bbfb4edabe4bfe9831929e1f3c7d176c40bc5f998be85b218b2a40b066a1c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE6 5380 bytes
font_01_sfnt_off00008149.bin
4f40f4faeec49b9084a67f4f4489c603ba744d142bc52ebd6ae95a06df43c032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8149 10192 bytes

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