Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9253198d49c52c2…

MALICIOUS

PDF

40.1 KB Created: 2020-07-30 13:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6cc0a435dd3db0e84ddc3007f856763 SHA-1: 10010990549b619a8386fe65d8fded827130755c SHA-256: f9253198d49c52c27bbdb052f12411caf9da4c06de41bc091bbd180732d905a8
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation and potentially book titles, suggesting a lure. The presence of numerous external links, many pointing to Shopify domains, further supports the idea of a link farm or redirection scheme designed to obscure the final malicious destination.

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.com/pify?keyword=data+structures+and+algorithms+made+easy+narasimha+pdf
    • http://files.centre5pinbowl.ca/uploads/1/3/1/3/131378779/1743294.pdf
    • http://files.cfstephenville.com/uploads/1/3/1/3/131383541/6711674.pdf
    • http://files.garyandfrancesgreen.com/uploads/1/3/1/8/131871453/6172804.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/66275259531.pdf
    • https://cdn.shopify.com/s/files/1/0435/2435/8298/files/wugimutomerara.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/24033927193.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6338597663.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/86943653168.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/benirujakosijifubupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/16923081329.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/92662479792.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/54862809505.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_off00005d0a.bin
25835da4b61f5992cf4a74c0376872d25c05ffc6c10876e535d043821f35e39f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0A 5552 bytes
font_01_sfnt_off00006fc5.bin
7c36634ec849fd29031fb304e47d63cfabfa0e7f8d431c0ddcfbf5f838e1baf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC5 10288 bytes

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