Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da8efa649228cbb…

MALICIOUS

PDF

37.0 KB Created: 2020-08-05 08:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d864a9c68b2777ae682886ebbcf882 SHA-1: 7075d4230124285c5a9060559b4e2a7ca6a20e27 SHA-256: 1da8efa649228cbb44f22e32b51e0a67efbf612f29819aeef218bdf7bdee1acf
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, pointing to 'https://ttraff.ru/pify?keyword=mindray+pm+60+pulse+oximeter+pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links to various PDF files, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the redirector URL and the link farm structure strongly suggest an intent to lure users to malicious sites.

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/pify?keyword=mindray+pm+60+pulse+oximeter+pdf
    • http://files.spmauzyandassociates.com/uploads/1/3/1/3/131398367/paridupe-gekunapo-laxodikiwuje-lojigo.pdf
    • http://files.oldragmasternaturalists.org/uploads/1/3/0/7/130775992/dedulo.pdf
    • http://minetanel.jenniferhayesstl.com/uploads/1/3/1/4/131453133/vonumisikajut-sinozoziru.pdf
    • http://files.waxthreadandscissors.com/uploads/1/3/1/8/131871533/6325964.pdf
    • http://files.popmovee.com/uploads/1/3/0/9/130969322/xuwubagabiwena.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/visaboxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/25362561047.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/nawirejejekuxudonodud.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/gukoni.pdf
    • https://cdn.shopify.com/s/files/1/0437/3879/2085/files/zazomekizurum.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6990/files/duvifokoruvapexagaxibugop.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/29834035584.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/12226197943.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/defazap.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_off000051cb.bin
27f84cdab3abbe9f6680ed25c181c57a1919a507d77d9fc75fac7470ed74a5b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x51CB 5660 bytes
font_01_sfnt_off00006509.bin
31548868d99f7e85285ee66d3dcb3dbb95d81e7dc56bcd6e1c86aa5e7641e16f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6509 10040 bytes