Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5bec08bc80dbc7…

MALICIOUS

PDF

40.0 KB Created: 2020-08-31 20:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbfaa4f2b1e16b240c699928a4e77923 SHA-1: 4345acf68af281077befa8a07bf70aa837fccfeb SHA-256: df5bec08bc80dbc728cf56f40c91e8e02df152bd302e1d4ed3b1e663a7456a0d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on static.usrfiles.com, which is indicative of a link farm. One prominent link directs to a known malicious redirector at ttraff.ru, suggesting a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=plant+parts+and+functions+worksheet+pdf
    • https://static.usrfiles.com/ugd/edb4a7_452e0743dc7e494685af979009937784.pdf
    • https://static.usrfiles.com/ugd/f09a9d_b20b959eb8974d8d89cbea51086502f0.pdf
    • https://static.usrfiles.com/ugd/40b9e6_fdfb3345911f494894e6fa10179407d7.pdf
    • https://static.usrfiles.com/ugd/97634b_3f7ea7681691408ba685a045bf3377ff.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/lerutixipafole.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/vim_delete_all.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/xigisatiluserobureva.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d9b60dec7474b108c153c26de6bbfe4.pdf
    • https://static.usrfiles.com/ugd/9e53d4_d8d328552c6b415186a2c36928090670.pdf
    • https://static.usrfiles.com/ugd/b8c837_494ce7cd60854615ac4991dba0fcfad5.pdf
    • https://static.usrfiles.com/ugd/b8c837_24a2109d6d6a4ef2a82f3fb2642d547c.pdf
    • https://static.usrfiles.com/ugd/b0b521_62cd1f7b7f404f1cb185af631bbfe11f.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_off00005d6a.bin
e14f0df84d93e21075f7931806f03871762b16c271b9811ea36789f2ded3e6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6A 5400 bytes
font_01_sfnt_off00006fd7.bin
98595fca7d5219729876db0dbc8858d3c873ba1b424cbea4189e756f2146f56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD7 10364 bytes

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