Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b661e4ef2fb32aa…

MALICIOUS

PDF

34.8 KB Created: 2020-08-13 13:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ec88a44826c5a6dacd1401c2c9ccf19c SHA-1: f833004f3a5a4502c9104eda57357ac01f18781d SHA-256: 6b661e4ef2fb32aa02ca6936a1757e52dbee34a3eac265d367667bc4941f93bf
194 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a redirector service, which in turn links to a large number of other PDFs hosted on Shopify. The ML classifier and heuristic firings strongly indicate malicious intent, likely for phishing or malware distribution. The document body text and embedded URLs suggest a lure related to educational materials, but the primary function appears to be redirecting users 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.cc/wb?keyword=present%20tenses%20review%20worksheet In PDF document text
    • http://files.prezziessugarloaf.com/uploads/1/3/2/7/132740606/niripuz.pdfIn PDF document text
    • http://files.zanieducation.com/uploads/1/3/1/4/131437513/9d9337.pdfIn PDF document text
    • http://files.gallowayflowers.co.uk/uploads/1/3/0/7/130776603/nivilo-gemovewutibi-zanis-xinorib.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/1/0434/2883/9586/files/33800608436.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/9991302640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/gexudenapusarilaramuro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4335/6825/files/amplificateur_d_instrumentation_exercice_corrig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/14061031793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9369/5395/files/pujajizutogive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/30426102697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/30650583494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/75233892633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/kopekoxinigowep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/95788519541.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 4

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_off00004c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2D 4748 bytes
SHA-256: 71ca21ab6c33cd7252019a319466e37c3da00417e7b06fba8f3952664e75a932
font_01_sfnt_off00005c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C64 10052 bytes
SHA-256: 0698b1d7593eabba341f8643bef075691fe94d5fcff1aacb71a1794f976b924b

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