Malicious PDF — malware analysis report

Static analysis result for SHA-256 37404b3edce5262f…

MALICIOUS

PDF

40.1 KB Created: 2020-08-09 01:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cc5506647d97b0da00d509d544fefa66 SHA-1: 4f9d04adcb6645b02f229ec1fabadee5b3d24b7e SHA-256: 37404b3edce5262f3c98e16ed10c342bb9eabd3b2dde50023086c2d57df89ba3
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute additional malicious content. The ML classifier strongly supports the malicious verdict.

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=berliner+platz+2+neu+intensivtrainer+pdf+download In PDF document text
    • http://files.saborlatinotacuari.com/uploads/1/3/1/4/131437889/2675522.pdfIn PDF document text
    • http://zegakipi.centerpointcomprehensiveplan.com/uploads/1/3/1/4/131437462/689f0fe98123.pdfIn PDF document text
    • http://files.wovenbirthservices.ca/uploads/1/3/1/3/131379246/3204fe827f8.pdfIn PDF document text
    • http://files.alexrawfootage.com/uploads/1/3/1/4/131407278/8144344.pdfIn PDF document text
    • http://files.rvabookloversfestival.com/uploads/1/3/0/7/130775103/dunabaremoluwusa.pdfIn PDF document text
    • http://bytlly.com/17i3q7In 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/1/0433/0999/0043/files/10044494378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2129/3974/files/68469065167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/fovexuzujamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/xojipevananukunafenowivub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/itunes_e4_b8_8b_e8_bd_bd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1880/3607/files/84236258210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/tavudufugaroturoxile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/82832401101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/boxojutanori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4877/1488/files/visual_studio_2005_redist.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/trane_cleaneffects_manual.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 8

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_off00005cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDE 5416 bytes
SHA-256: cb7de3c2ff49d07bbbfed69b1fefbd7279379038a1f80879d413a17e68352e12
font_01_sfnt_off00006f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7A 10848 bytes
SHA-256: 674401c09027443b0c31c6659cdad055ff22e0a3985f6402499618993ca06c74

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