Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71e4ceb038a883d…

MALICIOUS

PDF

37.9 KB Created: 2020-08-24 12:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c216d7257d246cc0fb82a3e26125a2bb SHA-1: b9c3eae5c33fbb41e14b20f706464b1299fcb4ee SHA-256: f71e4ceb038a883d6deb859c81f416c4113eb61089527bf658dd394fa9107ef2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 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'. The primary malicious redirector link, 'https://ttraff.ru/pify?keyword=iters+3+tip+sheet', suggests an attempt to lure users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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=iters+3+tip+sheet
    • http://tuxipejob.ascendiosa.com/uploads/1/3/0/7/130776433/5982dd.pdf
    • http://files.hajack.com/uploads/1/3/1/8/131856129/1df1ec37ff3.pdf
    • https://cdn.shopify.com/s/files/1/0430/6246/0577/files/58904791304.pdf
    • https://cdn.shopify.com/s/files/1/0436/2679/1075/files/86815072602.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3643/files/devexpress_mvc_report_demo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/foundations_of_college_chemistry_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/15875270105.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6298/files/97562528553.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4557/files/zojutedelelupuluxanuxur.pdf
    • https://cdn.shopify.com/s/files/1/0439/0472/9243/files/wipufosawuxorusolusujet.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_off00005833.bin
ee76e2e3c855af05d0fd39cf91e6a469f9c77f15a46d044d0171dbf0f73a2d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5833 4764 bytes
font_01_sfnt_off00006863.bin
6a5449161162e763e9f5ec438dd773042805cdf280d21a1160abd7dabecab490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6863 10252 bytes

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