Malicious PDF — malware analysis report

Static analysis result for SHA-256 a797c26420f94b99…

MALICIOUS

PDF

48.2 KB Created: 2020-08-18 17:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: af2014ffad3f8f6f1f22054a7fe5e166 SHA-1: c097ef5330c2e4a01ee591837ebb87f456da746b SHA-256: a797c26420f94b99c0d250467d3bf659953451eff31fc250da91fe815280807f
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 Shopify domains but are likely part of a link farm to improve SEO for malicious content. One critical heuristic identified a direct link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=oxford+clinical+medicine+book+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect users to malicious infrastructure under the guise of providing academic resources.

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=oxford+clinical+medicine+book+pdf In PDF document text
    • http://files.sophieewalterr.com/uploads/1/3/1/3/131381839/68d4bb2.pdfIn PDF document text
    • http://files.bigtimbercattle.com/uploads/1/3/1/8/131858592/544141.pdfIn PDF document text
    • http://files.numberworx.com/uploads/1/3/0/7/130739015/virazigobupemetilum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2545/7575/files/watercolor_portrait_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/aila_aila_nuakhai_sambalpuri_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/lire_journal_echourouk_algrie_d_aujourd_hui.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/86748272114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/nitiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3547/5624/files/kegajorexiduronokagapuxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/maxomasazaxavufilotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/0479/9639/files/lewafokuburapakipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/56396115027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/familia_boletaceae.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/95931527372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1048/8477/files/60504489338.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 3

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_off000073ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 5132 bytes
SHA-256: 679976d2933271af83f7cad372f2afb4d392c197f75e554d3fc399b5b579cc24
font_01_sfnt_off0000853b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x853B 9540 bytes
SHA-256: 62acc3ce99e794d75e1b5347a4e61d3674fbac743559b341d16c64a42601240c
font_02_sfnt_off0000a5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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