Malicious PDF — malware analysis report

Static analysis result for SHA-256 897f32af1231d22d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-09 08:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b749fb656eb74486c38e4d2bd376bcd7 SHA-1: fa4348c8c2be255e3b5fb4e83c2c6bb97f4ccada SHA-256: 897f32af1231d22d68db4d78a415fa6286e9b73255d9f5ac98e09f2b86c86e53
150 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 external PDF files, a technique often used for SEO poisoning or to obscure malicious redirects. One of the primary links, 'https://ttraff.ru/pify?keyword=classical+economics+vs+keynesian+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the target URL, suggesting a lure to external content.

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=classical+economics+vs+keynesian+pdf
    • http://files.creativemachineslab.com/uploads/1/3/1/3/131380845/9b605c2e7e4.pdf
    • http://files.fritzcornmaze.com/uploads/1/3/0/8/130874122/6aeb3aca0046.pdf
    • http://files.depaulsfa.com/uploads/1/3/1/3/131398541/4192270.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/gelolivuzebegujiluvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5492/3925/files/32895104814.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/12218640574.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1565/files/50336945347.pdf
    • https://cdn.shopify.com/s/files/1/0437/3564/6357/files/french_baroque_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/zesibekegapagixesumuvida.pdf
    • https://cdn.shopify.com/s/files/1/0433/7781/9802/files/jumovuto.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/sonotivoduposotod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/43911412269.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/pomamowu.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_off0000658f.bin
36fa5de8099aebcee9e7ef2c02f927b1c06cef0bd9a38efb47f16439e9b102f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658F 5336 bytes
font_01_sfnt_off000077b6.bin
52443497165b4139f24343b7ad68c4f933e59f6844d8c3d82f6f05a8e04614e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B6 10008 bytes

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