Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dca1a9228450f1…

MALICIOUS

PDF

34.9 KB Created: 2020-08-19 21:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7bc66f0f8c4186ba22520bcdfbf4a8 SHA-1: 8e3367db9968499165ce79ec83f4fc49c916ecff SHA-256: b1dca1a9228450f17e73ac90cf4bb3c2162bf857274d982bf29fc2f20cbc1162
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'endocytosis and exocytosis questions answer key'. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure, and the ML classifier strongly indicates maliciousness. The primary attack pattern involves tricking the user into clicking the malicious link, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=endocytosis+and+exocytosis+questions+answer+key
    • http://files.thelithaven.com/uploads/1/3/1/6/131606201/gukelotapejafubuf.pdf
    • http://gufora.fshockeyacademy.com/uploads/1/3/0/8/130813528/9164855.pdf
    • https://cdn.shopify.com/s/files/1/0434/8038/3653/files/lanubumugulobopubovibij.pdf
    • https://cdn.shopify.com/s/files/1/0432/6844/0232/files/pathfinder_bestiary_3_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/52098707372.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/66336637489.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/firuredezizu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9690/files/87078064265.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/73416095235.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/36773604320.pdf
    • https://cdn.shopify.com/s/files/1/0432/8200/6171/files/pentecostes_hernandes_dias_lopes.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_off00004c0e.bin
1a28ce3846dea3e86d7022e08ceb590c23ecbfa6147d0e74b7d41d85cf2f6c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0E 5312 bytes
font_01_sfnt_off00005e47.bin
67e97870b4ac881305e740ca20e3ecf6b38d8dbf422e12948dcfada0c91d4ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E47 9596 bytes

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