Malicious PDF — malware analysis report

Static analysis result for SHA-256 251d6a7798b91f71…

MALICIOUS

PDF

35.3 KB Created: 2020-08-20 19:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 92f58a26f4809cd8de352a78869d220e SHA-1: 30a8028e6adef9834db004dca1986b4137587bd2 SHA-256: 251d6a7798b91f71ebd666101880d58d90b2a1aa8cfa31a3d09d35c37e9d2ce2
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes the target URL and a seemingly benign topic, suggesting a lure. The presence of numerous external PDF links further supports a link farm or redirection strategy.

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=how+to+countersink+hole+in+sheet+metal In PDF document text
    • http://dabuvino.ontrumpstrail.com/uploads/1/3/0/7/130740178/43475bb2.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/1/0435/9746/3715/files/66921072438.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/29794362151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/73333796529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/3430272899.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0948/1626/files/vosukigofanalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9507/1651/files/guide_words_worksheets_for_grade_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/xafuzuxusazokesoruvido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/9496/2332/files/xafimorokenilun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/gavugididefumolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/11435889085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/58317274323.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/miller_and_levine_biology_chapter_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/degererikiwizoboliz.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 1

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_off00004de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE8 5156 bytes
SHA-256: 3fecf63ea1248282057924d7b32bb3d94f3c261e6aa9cde24fc037e7e8aa627d
font_01_sfnt_off00005f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4A 9656 bytes
SHA-256: 90e6937ca2116016e1c00aa0f2467ef8707a6349b9575e4abc8f4c52a47b41e5

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