Malicious PDF — malware analysis report

Static analysis result for SHA-256 857f3a45c87210f1…

MALICIOUS

PDF

32.6 KB Created: 2020-08-27 18:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 18f7747b616a198a48e39df114776c3c SHA-1: 7b244370850231519d642bfb58324b92d917c56b SHA-256: 857f3a45c87210f105614296d0cecffff7d2695a84571d978aae3b875e0aae99
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body text, though partially obfuscated, includes the lure "Genki 1 workbook answers" and a URL pointing to a known malicious redirector. This suggests a phishing or scam attempt designed to lead users to harmful content.

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.com/pify?keyword=genki+1+workbook+answers In PDF document text
    • http://metedopaj.storyatradingco.com/uploads/1/3/1/3/131380480/8935188.pdfIn PDF document text
    • http://files.myerstownboyscouts.org/uploads/1/3/1/8/131871453/64739.pdfIn PDF document text
    • http://dajug.stjosephsglenealy.com/uploads/1/3/2/6/132695643/jatesinerogad-fasixejejo-petivoj.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/1/0431/0673/0144/files/assembler_proqramladrma_dili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7381/4172/files/xidigipijareza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2076/9685/files/acta_constitutiva_sat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8790/4411/files/pikabonobubuwirap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3838/1992/files/69815506412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/37220087717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/susaxototujiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/7710/8647/files/ppt_template_roadmap_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6563/9073/files/kusumuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/minecraft_exploration_craft.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_off00004352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4352 5024 bytes
SHA-256: 487daba6e6783d5d1e9f9c9321d4d3eed7d038e6cdd6fff9e05b7d06ef3c0ae8
font_01_sfnt_off00005493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5493 9712 bytes
SHA-256: b9f4d4232108173f4ec9f8a310d7e3f12cdc7bba2e69d7b083d134ee16eccaf4

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