Malicious PDF — malware analysis report

Static analysis result for SHA-256 550ea623fddb7f2e…

MALICIOUS

PDF

35.8 KB Created: 2020-09-30 20:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-04-04
MD5: 98479cda4a8812103ed031f2270d91d0 SHA-1: 30723914364b37c15b7a75db9311c0b8d58552d5 SHA-256: 550ea623fddb7f2ea377c60c733802278158bfe116fbfbb775ca03f4173e9e49
194 Risk Score

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://ggtraff.ru/strik?keyword=livro+an%25C3%25A1lise+sint%25C3%25A1tica+visual+pdf In PDF document text
    • https://site-1037098.mozfiles.com/files/1037098/72920554235.pdfIn PDF document text
    • https://site-1037233.mozfiles.com/files/1037233/48068533147.pdfIn PDF document text
    • https://site-1039163.mozfiles.com/files/1039163/lulijijad.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/golegagenarewimudupumum.pdfIn PDF document text
    • http://fuzovepol.healthyeducationsociety.org/uploads/1/3/0/7/130776760/44dd1ea27c5bf03.pdfIn PDF document text
    • http://files.mskhor.com/uploads/1/3/2/6/132682570/fewogedawox-xabuguj-dajelenudunexo.pdfIn PDF document text
    • https://site-1037098.mozfiles.com/files/1037098/najebasaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004a65.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004a65.bin)
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/tavekenub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/is_antiform_and_anticline_the_same.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2458/7672/files/58535799002.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/facebook_video_chat_app.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 extracted file (font_00_sfnt_off00004a65.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A65 5384 bytes
SHA-256: 521dc25e8c090b26eb5fd06cafa23b1e34b58878e2f713e697380cc0accaa90a
font_01_sfnt_off00005c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C44 12372 bytes
SHA-256: c648bce8ba48cfc23ec958f6e74e8f98ddbf3c07733072485bd8d2e6ecbdc429