Malicious PDF — malware analysis report

Static analysis result for SHA-256 853b8013a9b7730d…

MALICIOUS

PDF

43.2 KB Created: 2020-07-08 23:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 8c37e99d6fd756643e7e1e21358fc989 SHA-1: 97db05dd08e9644e862c2f659a1e275ac27c8af4 SHA-256: 853b8013a9b7730dee3967f69b03f109c8bced3d47f10f13bc72baa58302bbbe
184 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL 'https://ttraff.ru/wb?keyword=eugene%20nida%20the%20theory%20and%20practice%20of%20translation%20pdf' is a primary indicator of this malicious activity. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to disguise malicious links as legitimate search results.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=eugene%20nida%20the%20theory%20and%20practice%20of%20translation%20pdf In PDF document text
    • http://files.charsrestaurant.com/uploads/1/3/2/6/132680869/1958753.pdfIn PDF document text
    • http://files.taichischoolofgentleexercise.com/uploads/1/3/1/3/131397934/67f5de.pdfIn PDF document text
    • http://files.breathewithlauren.com/uploads/1/3/1/4/131437351/424db3.pdfIn PDF document text
    • http://files.scratchartedinburgh.com/uploads/1/3/0/7/130740458/norefiliguwox.pdfIn PDF document text
    • http://files.mackenzieglobal.net/uploads/1/3/0/7/130740127/19966a.pdfIn PDF document text
    • http://files.mindscapegallerystl.com/uploads/1/3/2/6/132683111/1329c.pdfIn PDF document text
    • http://files.oostburgfpc.org/uploads/1/3/1/1/131163957/4c6095.pdfIn PDF document text
    • http://files.vicenzas-crostoli.com/uploads/1/3/1/4/131483253/9062675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pozugupikuza.files.wordpress.com/2020/06/muvawuja.pdfIn PDF document text
    • https://vadidulabop.files.wordpress.com/2020/06/92273915443.pdfIn PDF document text
    • https://novodotowivo.files.wordpress.com/2020/06/43710950365.pdfIn PDF document text
    • https://kuroluf.files.wordpress.com/2020/06/lekesodipud.pdfIn PDF document text
    • https://ratomanedaz.files.wordpress.com/2020/06/tafegujonol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A38 5360 bytes
SHA-256: 5380301bda65e08229db5a7b4803c4ce85b9abbed7bb8438e868aa6dd197a50e
font_01_sfnt_off00007c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7A 10208 bytes
SHA-256: cde4cdaad3e0415378bab2b16edf87c923b473d3e3be116b229a0ada7b0b9d83

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