Malicious PDF — malware analysis report

Static analysis result for SHA-256 85de7ba18e031aa2…

MALICIOUS

PDF

33.3 KB Created: 2020-08-07 10:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 733bbd661a614fad48abf9399f539329 SHA-1: ea76242c78d451570dfb13dad5bad6a7a1be1186 SHA-256: 85de7ba18e031aa2f9c376d4e88564cb7fda64952c0c200bda26a53a66274177
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a primary redirector identified as malicious. The document body, though obfuscated, contains text related to 'classifying australian animals worksheet' and the malicious URL, suggesting a lure for users seeking educational content. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector points towards 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/wb?keyword=classifying%20australian%20animals%20worksheet In PDF document text
    • http://files.roxieriverawriter.com/uploads/1/3/1/3/131378771/ripib.pdfIn PDF document text
    • http://files.heritageheroesptsa.org/uploads/1/3/1/0/131070378/0a34c625b.pdfIn PDF document text
    • http://files.damascusbaptistchurch.org/uploads/1/3/1/1/131164281/povoso_gepawisonut_simonirixomu.pdfIn PDF document text
    • http://files.broughtoncambridgeshire.com/uploads/1/3/1/4/131453214/dewutekesizu.pdfIn PDF document text
    • http://files.petercosimoleather.com/uploads/1/3/0/9/130969002/4226024.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/1/0431/5358/8390/files/966459587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/764225240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4321/7830/files/conjunction_of_time_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/19803254500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3006/9927/files/human_heart_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/salanokimumotiwis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2882/4742/files/mimul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81988232477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/bekotobesanamifekorozikan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/welarep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/wowoj.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_off000045b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45B0 5344 bytes
SHA-256: 92ae2830d856989474b254839308a2de61ea2422b5cb39575b1b6999e97c7378
font_01_sfnt_off000057c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 9468 bytes
SHA-256: 6bb2621414ce87850b0d243c99b000488995a9f1dd383513aecd52f44ba86dda

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