Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8f9dec0aa8dcad…

MALICIOUS

PDF

39.5 KB Created: 2020-08-27 17:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 08371504a34705e8c0d85964a21c1f4f SHA-1: 0fa13ca3704a67e6620056ba268b7504bf7e1a01 SHA-256: 7f8f9dec0aa8dcad2c1aab94a072f36c37281d481d68016cfcb2d9fd78dd4dd4
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains references to a scientific calculator and a URL that matches the redirector. The presence of numerous external links, many pointing to Shopify, suggests a link farm designed to improve SEO for malicious content. The ML classifier also strongly indicated maliciousness.

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=calculator+scientific+apk+pro In PDF document text
    • http://files.ukyorthoresidency.com/uploads/1/3/1/3/131383544/fd3f1ac304.pdfIn PDF document text
    • http://files.atasf.com/uploads/1/3/2/8/132816195/563820.pdfIn PDF document text
    • http://files.eliezercall.com/uploads/1/3/2/3/132302940/3168259.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/1/0434/5564/3813/files/dimetivapidaxikogaxuxet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/23013324079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8678/2371/files/report_damaged_card_chase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/6848/4758/files/boletin_oficial_del_estado_legislacion_consolidada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6784/2455/files/bubble_sort_in_c_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/atresia_intestinal_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/livopudixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/xetop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/dogofowamivodukuxudog.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 6

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_off00005d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2E 4976 bytes
SHA-256: f34120ac73014e5ac72eaf444b8b5bfff0698073da6676bc5c29e5f67bc8e0e4
font_01_sfnt_off00006e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2B 10312 bytes
SHA-256: d7286960bc1e2f4310c8cc904e434d79085c5b0a3d9f925184e5220109b5dbc1

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