Malicious PDF — malware analysis report

Static analysis result for SHA-256 b636ef87d40a6fbe…

MALICIOUS

PDF

37.2 KB Created: 2020-08-21 10:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 82507361c98099dc8ffa773d4e84d427 SHA-1: 9535e410dc8d1710c51814fac7bf8137d5332d1d SHA-256: b636ef87d40a6fbe5bad32623c22709204d416a09d88f932211d9b1923b9e9c3
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, disguised as an 'Oxford English Grammar Guide PDF', redirects to a known malicious redirector at ttraff.ru. This indicates a social engineering lure designed to drive traffic to malicious infrastructure.

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=oxford+english+grammar+guide+pdf In PDF document text
    • http://files.balancedandbehaved.com/uploads/1/3/1/4/131437005/4559983.pdfIn PDF document text
    • http://files.drummandassociates.com/uploads/1/3/2/7/132740553/98dea1c46.pdfIn PDF document text
    • http://files.scarboroughanimalhospital.com/uploads/1/3/2/7/132741128/gefejorasov.pdfIn PDF document text
    • http://files.edutobest.com/uploads/1/3/1/4/131411147/3376399.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/1/0430/7641/9744/files/cgmp_guidelines_in_pharma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/9435/1512/files/93353284745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0350/9914/files/78605084407.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/birthday_chocolate_cake_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/warhammer_40k_space_marine_codex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/divifubefebumikinesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/awana_sparks_curriculum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/99379885566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/68163755378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/putir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9313/8333/files/bopisevo.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 5

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_off000052b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52B8 5548 bytes
SHA-256: db949db1ffd92f5dd5fdf60bbdda874aa9be1f89157a3690d21f13a89eade654
font_01_sfnt_off00006577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6577 10100 bytes
SHA-256: 76c151844c1965eed8118aceb28bdd9fff64df3036551862f964a0776f067e08

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