Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a37403cd2589db…

MALICIOUS

PDF

36.8 KB Created: 2020-08-16 01:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a053b136cae5640b6525155fa21f46df SHA-1: 22d53833ad049ecdb7fbdf7ed06859d28c548280 SHA-256: 57a37403cd2589dbfc04f1b6576cc84399b64696524eacde8bb16ba9b3684f30
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to redirect users to harmful sites. The ML classifier also strongly suggests maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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=sociolinguistics%20spolsky%201998%20pdf In PDF document text
    • http://muboxewab.fullcircleperformingarts.com/uploads/1/3/2/7/132741066/9801835.pdfIn PDF document text
    • http://tevagif.aaronjgodwin.com/uploads/1/3/1/6/131607062/4366004.pdfIn PDF document text
    • http://files.chesterfootclinic.co.uk/uploads/1/3/0/7/130739315/1e8f04c22b31b4b.pdfIn PDF document text
    • http://matubu.rentalcottageontario.com/uploads/1/3/2/3/132303382/6780528.pdfIn PDF document text
    • http://silajitiz.theallergicchef.ca/uploads/1/3/1/6/131606289/fb584.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/1/0433/7175/7718/files/wijurow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/32638124.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/99666592961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/68296788789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewugokujugiwiburonanas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/davesabudovititan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5253/8787/files/90973245729.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/36469888771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/16148428719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2688/2471/files/andromonoecious_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/lurajunojulaxabuwusu.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 1

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_off000050e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50E6 5688 bytes
SHA-256: 4d05ae58965aee2f4301abca4077b5fa41464fce141a98f2261979d82472b0cf
font_01_sfnt_off00006462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6462 9976 bytes
SHA-256: bcf84bb763459ab8d56bbf2b4664e8f63c84d3bf67e61514d1aea5f82b381c48

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