Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91ca5f03207ca13…

MALICIOUS

PDF

46.1 KB Created: 2020-08-09 08:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 53931fdbb596efe5ee564d93a5bc1530 SHA-1: 7cefc62a392b6ae1f47f6489e01859029a3bbbf5 SHA-256: c91ca5f03207ca1302ecf2c4b4652bb45f0dd0af89cc268fc1f40301f3a8c094
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with the primary link pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to create a link farm or distribute malicious content through a large number of seemingly benign URLs. The presence of the malicious redirector URL strongly suggests the intent is 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=spurious+correlations+pdf In PDF document text
    • http://doxuzume.forestburgbaptist.org/uploads/1/3/2/6/132681947/3096031.pdfIn PDF document text
    • http://newow.kategrarock.com/uploads/1/3/0/7/130740517/9900213.pdfIn PDF document text
    • http://files.lauriamusic.com/uploads/1/3/1/8/131857315/7329853.pdfIn PDF document text
    • http://fobutopow.cedarspringschristianchurch.org/uploads/1/3/2/3/132303382/dccd4.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/sopituwoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1918/1985/files/77896793389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/lgebra_de_lie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/39479444182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1512/5662/files/albert_camus_the_stranger.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/gowabigodegexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3599/0936/files/ejercicios_frutas_y_verduras_en_ingles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/zoxozolurutinezusedemeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/nirusud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/dalapesadaxafivokopegenut.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6093 5252 bytes
SHA-256: 6d56553774bfaa696a48c9ec440cbf200d6805b3c16add8751dff6e8773ba602
font_01_sfnt_off0000727f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727F 10488 bytes
SHA-256: 416186c1dc5eae00e6ff739b4dfa3bd77a3c960fd505aad229c5ef866c7f4a6b
font_02_sfnt_off0000969c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x969C 16084 bytes
SHA-256: 249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb

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