Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cbb7f74d5418fc…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 20:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 40d18c0acb1bf918668586c13fddbfb8 SHA-1: 4833a7935dd5e3bb7c73d08c1d1112078f01d6e0 SHA-256: 31cbb7f74d5418fce876ce5862b5d6ae0c66954911c9e5681a928ac1cd140f65
194 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=tipos+de+contaminacion+del+suelo+pdf'. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a coordinated effort to distribute malicious content or phish users. The primary attack pattern involves luring users through these links, likely leading to further stages of infection.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=tipos+de+contaminacion+del+suelo+pdf In PDF document text
    • http://xetajuk.anneboring.com/uploads/1/3/0/8/130813747/8491483.pdfIn PDF document text
    • http://vifukupun.xmomentsports.com/uploads/1/3/0/8/130874064/ruzurulolaxox.pdfIn PDF document text
    • http://files.gregantoursireland.com/uploads/1/3/1/6/131607054/4553254.pdfIn PDF document text
    • http://sunut.frankechenhofer.com/uploads/1/3/0/8/130814328/xapexavisur_jepibot_jonesivoguv_sesugezuzipita.pdfIn PDF document text
    • http://ligiw.nakedvanity.co/uploads/1/3/1/8/131871864/5174916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/sobunef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/canadian_ballast_water_control_and_management_regulations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7056/9113/files/53936050878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46496449222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/fujavojabixamifebusomuju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/zamulowumelosaza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/8145365228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2532/5467/files/xadawalobidenavewus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/zodanadoperuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/gejusutoxizivamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/wawuriwafaku.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_off00006a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A34 5156 bytes
SHA-256: 931f5d655a85e983cb21bba31bd0677acdbab881885722a7a9381ce702a550dd
font_01_sfnt_off00007ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA3 10660 bytes
SHA-256: 379e46e7af702f4c82cf20d691c0d0df3b9b621cc4ef25db95d7bcb67c3e8623

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