Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86777fb13e50371…

MALICIOUS

PDF

40.1 KB Created: 2020-08-05 16:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6c809db43c5fa1a6d9ff900312f43848 SHA-1: ecec6418e911d81562488655667462011841d114 SHA-256: e86777fb13e5037163db148587de482595a23383a1fa750a4be3666f193e43b6
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'free math worksheets' and includes the malicious URL, suggesting a lure to a malicious site. The presence of a link farm heuristic further indicates an attempt to distribute malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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/wb?keyword=free%20math%20worksheets%20for%203rd%20grade%20multiplication In PDF document text
    • http://files.coronadonaples.com/uploads/1/3/1/4/131437402/8d6b02901d4f155.pdfIn PDF document text
    • http://files.shipleyartstudio.org/uploads/1/3/0/8/130873738/pirodi-purirexepo-sotubifav-wavilolujufuna.pdfIn PDF document text
    • http://files.theheids.net/uploads/1/3/0/7/130739971/6148588.pdfIn PDF document text
    • http://kunapus.ras.saintleoresidencelife.com/uploads/1/3/1/4/131438216/9980825.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/1/0432/6332/8411/files/97261863201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/24443178790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/94356750095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/99961326282.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/curso_de_ingles_avanzado_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/elternbrgschaft_mietvertrag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/79728180659.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/siwifoxenajuxi.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_off00005c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2D 5844 bytes
SHA-256: e03f85314dc3a04f1383fe8b8cf91a75f50483547a67bdea253a299d6408ae09
font_01_sfnt_off00006ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFE 10288 bytes
SHA-256: 314e276153aa52144a3a9c53bd59979e20bce3807eec6f26b2f10084470a1d5b

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