Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c72519a87260f…

MALICIOUS

PDF

42.7 KB Created: 2020-07-26 16:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c7f132518000d4d3d6ff5350059761f0 SHA-1: 636633bc251a33d17d6dfef3ddb6c19e9552a410 SHA-256: 845c72519a87260f159d280e2a174cc2798d8ffe23415655bad95b38610481a9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to redirector infrastructure designed to obscure the final malicious destination. The primary redirector URL is `https://ttraff.cc/pify?keyword=oxford+handbook+of+clinical+hematology+pdf`, which is used in conjunction with SEO link farming tactics to lure victims. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or malware distribution attempt.

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.cc/pify?keyword=oxford+handbook+of+clinical+hematology+pdf In PDF document text
    • http://files.sarahtorti.com/uploads/1/3/0/9/130969368/newabazu.pdfIn PDF document text
    • http://files.covenantbiblecamp.org/uploads/1/3/0/8/130874352/4355132.pdfIn PDF document text
    • http://files.diasalinas.org/uploads/1/3/0/7/130774979/5e8b10c9322.pdfIn PDF document text
    • http://files.naturesconfluence.com/uploads/1/3/0/9/130969820/winirikitiwik.pdfIn PDF document text
    • http://files.italybooktours.com/uploads/1/3/0/9/130969704/5360918.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/1/0428/6454/1852/files/runuzamufef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/vokagusesofovovevadegezof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9816/8727/files/weganewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jomanumono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/70851846884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/sevisujugow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/guwunag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/29719304838.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62654677968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/poxesomolenosexazamov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.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_off000067f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F2 5580 bytes
SHA-256: be8225fb750c9e879ac49b8d2f4dbd882dc7b320acf5d4755fa11259bbbb2926
font_01_sfnt_off00007ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC9 10116 bytes
SHA-256: 504dcc2e7cef22489202a7e3b8334bd2436d55d68ec01fc95d58d4230d7ac89f

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