Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d4aabf61cd907d…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 05:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1f9450a9785bab96284011d13d60bbdd SHA-1: e83f766ad4d923eb4df283e371c078908cf0687b SHA-256: e4d4aabf61cd907d9195ad03d6d0766c245c4539ed9768f904b0f9f35c8a669a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests a link farm or redirection scheme, likely for SEO manipulation or to distribute further malicious payloads.

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=critical+care+nursing+a+holistic+approach+pdf In PDF document text
    • http://safezov.ishtaryasin.com/uploads/1/3/0/8/130814328/72b8cade0bd968.pdfIn PDF document text
    • http://files.daniellesusi.com/uploads/1/3/1/6/131606268/6149620.pdfIn PDF document text
    • http://files.thebettajivereview.com/uploads/1/3/1/4/131437242/wibuganaforiwu.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/1/0433/0687/7080/files/74523611049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9408/0677/files/5117439907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/10371692284.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6727/6454/files/sigosewesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/lubij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0703/9895/files/identifying_character_traits_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/kexagilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5238/1846/files/bronkitis_dewasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/tenoxifogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/delamunago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/28412436374.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_off0000624b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 5320 bytes
SHA-256: 9c166af41a16bc9efbf0a68a627bbf34e3e21c12126dcf467581adcc2f9845c8
font_01_sfnt_off00007453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7453 9912 bytes
SHA-256: 2009b1591cd7e0b24fdb89adf8d9022ce08132a1d72d460492fe7831164383b5

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