Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40a7571db335fe3…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 01:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 57bfa7d9e256a5cc6093d4148f2fa586 SHA-1: 75f8e4b0709298824028f95c55705c7ce1411fdb SHA-256: a40a7571db335fe3b2518f2d6afbe98d0d118c73238159ee0f122d0dd1923c23
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The document body contains text that appears to be a lure, possibly related to search engine optimization or content farming, which is consistent with the PDF_SEO_LINK_FARM heuristic. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware delivery site.

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=tera+bazz+song++pagalworld.+com In PDF document text
    • http://files.musicforminors2.org/uploads/1/3/1/3/131380591/wiwuketizevisovupone.pdfIn PDF document text
    • http://kakoj.placerconservation.com/uploads/1/3/2/3/132302956/sovak_xenetuvukuji.pdfIn PDF document text
    • http://lekuvajup.sarahdronfieldproofreader.com/uploads/1/3/0/7/130775795/2028229.pdfIn PDF document text
    • http://files.ojrbandmpo.com/uploads/1/3/1/4/131453302/9c1511.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/1/0428/9835/8432/files/39858795743.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6514/3449/files/calculus_and_analytic_geometry_9th_edition_solution.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/birizakidunupujudexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1024/2198/files/22001391890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5963/4591/files/sixemeridadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/9238198408.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/nerapusimobezaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/galanibowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/14567737910.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6861/1996/files/25929629531.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 2

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_off000057f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57F3 5656 bytes
SHA-256: 3b75168e9b043c432ee07bc9fe7b55bbb1c2cec3878c3cebc20be68ee9a6b9f8
font_01_sfnt_off00006b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 13792 bytes
SHA-256: a46695db02f3ddb671e748601dc033cd0b5cb942ec31f372301aa3bc9f57bb64

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