Malicious PDF — malware analysis report

Static analysis result for SHA-256 f903ab7759bc49fe…

MALICIOUS

PDF

39.7 KB Created: 2020-08-25 08:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d57bc3a5ef28958ac979712ecce1030c SHA-1: 2ca074a978cbac76e54d2b2381d576314a7acd36 SHA-256: f903ab7759bc49fefca105322fb7bdb40a1ac512a8914b50fb991a74b455b7b7
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the document's primary purpose is to direct users to external, potentially malicious, resources. The ML classifier strongly supports the malicious nature of this PDF.

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=different+forms+of+communication+worksheet In PDF document text
    • http://files.miguel-castro.com/uploads/1/3/1/6/131606343/d3b8effd00.pdfIn PDF document text
    • http://files.karnseverson.com/uploads/1/3/0/8/130874064/wefumez.pdfIn PDF document text
    • http://lotesolu.kira-marie-mccullough.com/uploads/1/3/1/0/131070872/d47232fa8a8.pdfIn PDF document text
    • http://padurotut.incubator143.org/uploads/1/3/1/3/131379394/4068087.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/1/0430/4555/2290/files/rimesenulom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/dapebawajidevavedozinujum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4517/3910/files/lichen_amyloidosis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/6166/7992/files/70540360105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/bezexevuzaxokewuduwiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3397/0086/files/dragon_naturally_speaking_commands_cheat_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/puroge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/6645/0074/files/dj_dance_video_hd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/diploid_vs_haploid_chromosomes_worksheet_answers.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_off00005d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D53 5244 bytes
SHA-256: ed6673b38bce85f9ef2b01bd3e1c5ca098909197920b818d268c137d68f7e679
font_01_sfnt_off00006f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F19 10296 bytes
SHA-256: 5cb011803fd8048b7b330d677254314f1f3ce2da442fb6c82070857bced95513

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