Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f3fb6e3da41c8a…

MALICIOUS

PDF

70.7 KB Created: 2020-08-06 20:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b521fe4ed09f886b6cd9944b1859191a SHA-1: b8eee3f4009cdd7a90e336ec0b87d499d8aa29b1 SHA-256: 93f3fb6e3da41c8a0c7a9fe31688d0881fed4abf1195773b574e72ccbc70e400
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 external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic firing indicates a direct link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=barrera+hematoencefalica+histologia+pdf'. The document body, though heavily corrupted, contains this same URL and a reference to 'wkhtmltopdf', indicating it was likely generated by a tool for creating PDFs from web content.

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=barrera+hematoencefalica+histologia+pdf In PDF document text
    • http://files.addictionrecoverymovement.com/uploads/1/3/1/4/131437878/bavizaruwavukasodowi.pdfIn PDF document text
    • http://files.danielakfineart.com/uploads/1/3/0/7/130738548/6191127.pdfIn PDF document text
    • http://files.atelei.com/uploads/1/3/1/3/131398059/51e168e389130.pdfIn PDF document text
    • http://files.mysciddoc.com/uploads/1/3/2/6/132681343/3534375.pdfIn PDF document text
    • http://files.reneeleaberger.com/uploads/1/3/1/4/131408854/kaduzomap-lenipavururu-giwuvugegen-zebavurix.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/1/0432/7555/0876/files/87782069867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/galaziwidugaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/85852706664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/52595649025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9718/5701/files/logitech_remote_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/lenemanuzurel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/kepurezepuxuvuvemod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/pimedirebififugatupuxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/essential_biochemistry_3rd_edition.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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 5616 bytes
SHA-256: 0b0088338ef026636fce1488701566f75b8bce75081d251916fef63169fe0b7d
font_01_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 10948 bytes
SHA-256: 8b6c9196ea89fb269c7def413bde9da8e4a383372a66b9421e408daa2e041d48

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