Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cad6a1cd5e0dda1…

MALICIOUS

PDF

44.7 KB Created: 2020-08-02 14:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d2312ffdd7ad88285e8bda5dce60c3 SHA-1: 91f6d17a8a834d08c54603d3ef3d076183c743b9 SHA-256: 0cad6a1cd5e0dda1dfce8495fa355111002947667477e1d29dc14ecdf8c7c53d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of these links, disguised as a 'convert kilos to pounds' tool, redirects to malicious infrastructure at 'ttraff.ru'. This suggests a phishing or scam attempt designed to lead users to potentially harmful content. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate malicious intent.

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=convert+kilos+to+pounds
    • http://files.guliagurevich.com/uploads/1/3/0/8/130814666/7526060.pdf
    • http://files.karencostawriter.com/uploads/1/3/1/4/131484029/7746533.pdf
    • http://files.pierpontchurch.com/uploads/1/3/0/7/130739951/ximitarovu_jazejukijipax.pdf
    • http://files.frankmshih.com/uploads/1/3/2/7/132741334/wodadoloki.pdf
    • http://files.greaterorlandotrn.org/uploads/1/3/1/3/131383533/1074f37e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/gejixidipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jazaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/36481256358.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/11500179392.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/discovering_geometry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7593/files/tadefebi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1927/9259/files/vogebezileboxibuwe.pdf
    • https://cdn.shopify.com/s/files/1/0438/3539/2150/files/zopiraxezuwuzenevugiwizow.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/63803572528.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18491093394.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/tixonivufoja.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/92284732926.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006968.bin
262586dd9e7e1eabbfee5fda62ffe2f9f56796a11f9abeeb5e884dcd870387e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6968 4772 bytes
font_01_sfnt_off000079b8.bin
c2d74a9ac0534dd2e1b33a2315a0cc942b9d9f5278fb4f08fb1fae8679a57227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B8 13640 bytes

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