Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba462c86f98ea6e…

MALICIOUS

PDF

38.4 KB Created: 2020-08-16 22:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 493835bd3d7cf60eadf852489000db31 SHA-1: 575321dbbbfcb648b829c606e3709585c25bf758 SHA-256: 4ba462c86f98ea6e799b9e6f90f7bcb1280b6aaf102db4fcd0e7e3472d2a368a
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site disguised as academic content. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics strongly indicates a link farm attack pattern.

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.com/pify?keyword=beer%2527+s+law+lab+phet+answers
    • http://files.davidwalshbowlmaker.com/uploads/1/3/1/8/131858540/45efa.pdf
    • http://files.soulosphere.com/uploads/1/3/1/3/131379724/rozadego.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/45721264828.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/calligraphy_worksheets_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/1758/2230/files/2476503318.pdf
    • https://cdn.shopify.com/s/files/1/0435/9910/2115/files/28230083889.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/teks_texas_algebra_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/77555135719.pdf
    • https://cdn.shopify.com/s/files/1/0433/7414/9793/files/22182470143.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/15361765728.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/wuzowunurukalajogapuzazu.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_off00005845.bin
d8042b04fc584988624ce4107b824bbfce1f08d2146d1fa86175d4d1a39a5d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5845 5220 bytes
font_01_sfnt_off00006a18.bin
8a09b703620494c8a98efb2bd4e45371fba4a8154e62a6522d5af8cb59c69a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A18 10176 bytes

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