Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b6e7396e029d4f…

MALICIOUS

PDF

40.5 KB Created: 2020-08-10 04:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 21d80f75a3bb035e7f7ac03b6d5058b6 SHA-1: 124c98c0bb9ff36e55b33d418c9aa0d236fc6180 SHA-256: a3b6e7396e029d4f7ebbd858d6adc359cfe7a35d8e7844f1426e16b1fc33116c
194 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of numerous embedded links, many pointing to a redirector service, suggests a phishing or scam campaign designed to lure users to malicious sites. The file was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms.

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=animus+y+anima+pdf In PDF document text
    • http://files.nwoqmra.com/uploads/1/3/1/4/131453124/9495074.pdfIn PDF document text
    • http://vewulex.ausneaks.com/uploads/1/3/1/1/131164250/924b14b.pdfIn PDF document text
    • http://files.allprorepairnc.com/uploads/1/3/0/7/130775823/nejakeromelamop_vitojone.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/1/0428/9835/8432/files/34530012154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/topuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/2215/9772/files/class_10_maths_solution_chapter_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwizesovipijekugufex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/vuxituru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9174/5185/files/assembly_chart_adalah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2291/6520/files/50464976620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8678/2371/files/bugij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/vonokofujaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/nitovun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4429/8133/files/an_introduction_to_the_physiology_of_hearing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/6826/5372/files/brittainy_c_cherry_the_silent_waters.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 7

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_off00006104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 5148 bytes
SHA-256: 8644c40c67b624e6b4a265dba1be5a35a523e403ffeba5c0338e51e991379aa8
font_01_sfnt_off00007284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7284 9644 bytes
SHA-256: fe4f0a4c797bb6dde067c17a32b02f55cc1090887999c858ce53c1401b45e30d

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