Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6436df2a7495c5…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 11:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37475dbc00c7d503089f8f2efc813dc5 SHA-1: 93824c058221c6384695f3b3ed7738a08e38d43f SHA-256: ca6436df2a7495c5df15c3fe9ad4d1a5655468e269680b5dccc8b6acec7ea70f
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, 'https://ttraff.ru/wb?keyword=ecobee%20smart%20si%20thermostat%20installation%20manual', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to trick users into visiting this malicious site by posing as an installation manual.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=ecobee%20smart%20si%20thermostat%20installation%20manual
    • http://wokaxeliw.lakesidepresnurseryschool.com/uploads/1/3/1/6/131636664/ecf7171117010.pdf
    • http://mutiniv.amidalifecoaching.com/uploads/1/3/2/8/132814930/5160961.pdf
    • http://buwinomu.darrenlingard.co.uk/uploads/1/3/1/4/131452938/rejulo-rizukixovubarut-jeveja.pdf
    • http://files.sentinelfarm.com/uploads/1/3/0/7/130740517/9205638.pdf
    • http://votiv.isrusty.net/uploads/1/3/0/7/130739590/b8895f22e12c7ce.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/30233804197.pdf
    • https://cdn.shopify.com/s/files/1/0429/5393/2966/files/22930615688.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/11391429457.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/walunelel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4447/8874/files/30530168031.pdf
    • https://cdn.shopify.com/s/files/1/0435/7482/1019/files/sujuneza.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/66741825591.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8707/files/ielts_reading_actual_test_vol_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/vezedopimipumikad.pdf
    • https://cdn.shopify.com/s/files/1/0436/2184/3106/files/81913559180.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/91417400612.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8904/files/bifakigodok.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_off0000685a.bin
5cca77e79cd7256ae8dd83945c128cb4fa66157d10d4c52dab77e1b3b242c5cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x685A 5136 bytes
font_01_sfnt_off0000799c.bin
69653b79a19933f66cc9269388f82b13696ad07d7c2ab97c001d65f7dc750dc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 10324 bytes

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