Malicious PDF — malware analysis report

Static analysis result for SHA-256 213cd3194929ff4e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-04 03:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa072369824529f88195a2b82615fb6d SHA-1: 98f19207c05998dbc701d52db2d8fff273ed0a97 SHA-256: 213cd3194929ff4e0a517aac9af65892d7e81cbee03507b1dfbd50d22706a156
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. One of the embedded URLs, https://ttraff.ru/wb?keyword=hybrid%20costing%20system%20pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'hybrid costing system pdf' and appears to be generated by wkhtmltopdf, suggesting a lure document designed to host a large number of links for SEO manipulation or to distribute malicious content.

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=hybrid%20costing%20system%20pdf
    • http://files.absoluteconsultassociates.com/uploads/1/3/1/4/131410158/5675666.pdf
    • http://files.benfranklintech.net/uploads/1/3/2/8/132815359/gemobugasuzo-xuduketasap-mewixaju.pdf
    • http://files.ruffrescuewalkercountyal.org/uploads/1/3/0/8/130874510/699f81f91abee0.pdf
    • http://xopatiwob.mindbodyhealthnurse.com/uploads/1/3/0/7/130739783/5a8f69f.pdf
    • http://files.traceymackay.com/uploads/1/3/1/4/131453990/ca4ee.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/sumevugapoxukazegabopemok.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/82938684959.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67279733654.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0735/files/jiberenowokubiridabor.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/kanomuxifopogujax.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/how_to_disable_bot_commands_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/59591134067.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/91469926482.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/86545677661.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/54702868155.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/nadamewejugufapokinaton.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_off00006008.bin
73b92ddb9f5128ceb9704d87b2487bab0e99f9c73a19e49e17496db87ed5174d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6008 5436 bytes
font_01_sfnt_off00007275.bin
699845ee42ce3aca4591119f88e7378f081a2c33b51c7a680c91bfbf1e461e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7275 10284 bytes

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