Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac5c2f981e554f8…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 17:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d98cd00cfedd55fc4079a41c03425c SHA-1: 2014a56d89913458cb32cdca20eddd60f92a709a SHA-256: 2ac5c2f981e554f852c4336f41cd0bcee9b343857c0fd876415058d2c1efc4f5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=interview+attire+formal+wear', is designed to lead users to malicious infrastructure. The PDF also features a link farm heuristic, pointing to multiple benign-looking PDFs hosted on Shopify, likely for SEO manipulation or to appear legitimate. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=interview+attire+formal+wear
    • https://cdn.shopify.com/s/files/1/0434/4361/7959/files/updated_affidavit_of_support_form_i-_864.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/92687104833.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3046/files/fafewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/96574691624.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/70564589328.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3816/files/21187905995.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4992/files/67877276724.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12909571685.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/16800315647.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/fagipebo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4854/8005/files/degogemizesekarumomipe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/90659053438.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/antibiotics_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/calculus_derivatives_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/hdfc_mutual_fund_application.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_off000068ec.bin
928af14042f189233e46301d5f33c234bef03190d2dc8ac3904e9038fbf66913
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 4824 bytes
font_01_sfnt_off00007952.bin
9b7683dc188587e4824958fb8716670e894c0bfbd17f39212855391e8229475c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7952 10116 bytes