Malicious PDF — malware analysis report

Static analysis result for SHA-256 851a5b36bd789f78…

MALICIOUS

PDF

43.3 KB Created: 2020-08-14 13:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a06f52611cca636abbde6c33f0e124d0 SHA-1: e1affc26081f4bcdfcf17a3c29e6fbde7dcc396a SHA-256: 851a5b36bd789f78ce36f1b0be2d30e155818c23ab6a0f3fbe101d0a974ec4a1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to a redirector service, suggesting a link farm or phishing campaign. The document body, though malformed, includes text related to a 'publisher author agreement form' and a malicious URL, indicating a lure to trick users into clicking potentially harmful links. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a redirector and part of a link farm.

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=publisher+author+agreement+form In PDF document text
    • http://files.discoverycdtech.com/uploads/1/3/1/8/131871992/f2b4e60cce3.pdfIn PDF document text
    • http://files.echolightaussies.com/uploads/1/3/1/0/131070689/sugasi.pdfIn PDF document text
    • http://xoturun.d8cre8.com/uploads/1/3/1/8/131856190/bikivovilumefom.pdfIn PDF document text
    • http://files.suderve.com/uploads/1/3/1/4/131438241/6399523.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/1/0429/1677/4054/files/ziduvokimogetuxelaga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9273/8201/files/powepebas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3066/5637/files/22374320812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/2446/0445/files/gutitonezenas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/bobinado_de_motores_electricos_rosenberg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/design_and_analysis_of_algorithms_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/esv_study_bible_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/29902380153.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9727/9908/files/wordly_wise_3000_book_5_lesson_19.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/verklarende_afrikaanse_woordeboek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/counting_atoms_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 4

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_off00006a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A99 5320 bytes
SHA-256: bddd0e2f86599bca95c009f9fcc094bb22dc642a15fc0d73178da3b5af8fa25c
font_01_sfnt_off00007c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C85 10312 bytes
SHA-256: dee9607712de7a0b1ba1cc2a9d9415b535dd6c80717bd3064f6b1f47543925ab

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