Malicious PDF — malware analysis report

Static analysis result for SHA-256 18956d89a372f341…

MALICIOUS

PDF

47.6 KB Created: 2020-08-19 21:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 465e5aeb58adc0b2f782c15ef08e32c8 SHA-1: dc5c93dd9598c00162cafe65a00c347ad5f3200a SHA-256: 18956d89a372f34152de69ee86e7c8658e7c42ee53745c1a51ca45a862299895
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=advertisement+video++free', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for 'advertisement video free'. The presence of numerous other PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=advertisement+video++free
    • http://nepaxu.yesindustrialsupply.com/uploads/1/3/0/9/130969280/212746d.pdf
    • http://files.cchsguidance.com/uploads/1/3/2/6/132681725/fibigofefoke.pdf
    • http://rerut.traceyknapp.com/uploads/1/3/0/7/130776132/6182988.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/labor_economics_borjas_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/70935522586.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/juxikisagulelufolamadu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2646/files/36232546709.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5195/files/66350508979.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/mufiroxeviwafof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75815848510.pdf
    • https://cdn.shopify.com/s/files/1/0428/6752/3743/files/62205559963.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/xogenakoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/8116/3157/files/24217517677.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/16693760982.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruxejuvekega.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_off00007b99.bin
49bd660285c0c65c30bb9754b030c94ecbd2e8661d88ab8d02b11adcc713f223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B99 4860 bytes
font_01_sfnt_off00008c12.bin
8ea129a37b10dd063835dd0390d40f3376de680324bf479ac5158e0c0f0f4136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C12 11080 bytes

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