Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19789396d5d1066…

MALICIOUS

PDF

39.6 KB Created: 2020-08-29 15:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c56580bf980195c78d9a38cd3ed9b85f SHA-1: bacea2c3867f0d520d18fd75388d07ce7c541948 SHA-256: b19789396d5d10661958fe5ce1625d9aaa5954e011a53da7b7c5422ecd42db4e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=crx+performance+parts'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external PDF links, with the primary one being 'https://cdn.shopify.com/s/files/1/0433/4954/1017/files/39531406181.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to 'Crx performance parts' and includes the identified URLs, suggesting a lure to a malicious site disguised as a product listing or related document.

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.cc/wix?keyword=crx+performance+parts
    • https://cdn.shopify.com/s/files/1/0433/4954/1017/files/39531406181.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/munosotodogikenasiwumosub.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/6606567609.pdf
    • https://cdn.shopify.com/s/files/1/0436/5441/4494/files/10688773172.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/business_intelligence_analytics_and_data_science_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/xuwobeginam.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/kavimidamixufixiwati.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/pressure_points_in_human_body_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0437/0608/9640/files/61399224759.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/workforce_development_fund_claim_form.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_off000059f0.bin
ea524f8b1c0f737ba389adf20f93cc408c489267bcfaa9a8fe13771d3293efcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x59F0 5100 bytes
font_01_sfnt_off00006b32.bin
89acee3de98ae5b173f5608bdac209d57f981440071468ac116b42bc8ecddee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B32 11848 bytes