Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bb5e9a753fcc25…

MALICIOUS

PDF

43.2 KB Created: 2020-08-20 18:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4ee4611b2e52d567b9299bc6919b0f25 SHA-1: 8df40a7caf2e74b26c1b9dce70967e792f5d1408 SHA-256: 40bb5e9a753fcc253a1811cb710c23ae5ca2982f6303cf9d89702e0b7bed8ae1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with the primary heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'vocational skills worksheets' and includes the malicious URL. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly benign links.

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=vocational+skills+worksheets In PDF document text
    • http://zunopat.jenniferborkowskidesigns.com/uploads/1/3/0/7/130775166/c18e5453.pdfIn PDF document text
    • http://babijine.emsworthstandrews.com/uploads/1/3/1/4/131453060/jofudakebat.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/1/0438/3706/3328/files/office_365_for_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0584/5397/files/75752011482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2416/0667/files/24373353268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/dazorepobidod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/kirepumixevuxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/wegadojarefabepisejenolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0355/8564/files/95226192638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/active_and_passive_voice_quiz_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4963/2415/files/8775813379.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 3

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_off00006c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 5008 bytes
SHA-256: 7412df5e1f86a2a04e2b194d98234413d00b04da964f8bf1090324a012f14af1
font_01_sfnt_off00007d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D66 10192 bytes
SHA-256: 37a5bfcc84686199c6a295ab05ed172643c191c165d0a6a7b9f2caf3e8a38b64

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