Malicious PDF — malware analysis report

Static analysis result for SHA-256 76513260ac063cf9…

MALICIOUS

PDF

53.9 KB Created: 2020-08-15 18:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9622e92dddf08a339ba1e6865fb9f852 SHA-1: f25d19e5461d33d0779410a1b23043c7463c2b65 SHA-256: 76513260ac063cf9e9c9e7a62462a5827edab371783871cfd95aee2254728fd6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'solving inequalities pdf worksheet', suggesting a lure to trick users into downloading or accessing further malicious content. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious intent to lead users to harmful sites.

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=solving+inequalities+pdf+worksheet In PDF document text
    • http://files.ardsbattalionbb.org/uploads/1/3/1/3/131398367/juluz.pdfIn PDF document text
    • http://xokone.kengallucciocup.com/uploads/1/3/0/7/130776499/84c6fc6a77fa.pdfIn PDF document text
    • http://files.erictigley.com/uploads/1/3/2/6/132696029/8971624.pdfIn PDF document text
    • http://kesema.operationcleanoutia.com/uploads/1/3/0/7/130738970/c69b832470f.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/1/0436/9380/1625/files/welebeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/55946479205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/14918349994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/grade_9_english_module_4_anglo_american_literature.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/batewufetiruzuva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/90341406986.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2613/7756/files/vubofagilareragalumulaxew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/7806962092.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8739/6004/files/boost_your_self_esteem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4227/4454/files/mobo_market_downloads.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/78119407667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6296/5912/files/fepupejorevukadenip.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_off0000869b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869B 5748 bytes
SHA-256: 9a09987d9b6018159fca9fd8387cf2e09e03aa9aa36b9156bc4bd4e0d149498b
font_01_sfnt_off00009a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A35 15592 bytes
SHA-256: 44a4ed0655c5de1951cb54195e01dab7d9d99dbf8dba564ac8a2d7a8e46d0a9d

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