Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c3f21ef5858366…

MALICIOUS

PDF

50.8 KB Created: 2020-08-08 15:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7f5efac0f8b64d5d8c3ed75336dc8e4b SHA-1: 750de77f1acc250a838d643a50613b93912fb9e0 SHA-256: 81c3f21ef5858366144d3c530d2d143d37c0b70b1f451d081aee95cef4c4a3c5
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.com/wb?keyword=angina%20inestable%20diagnostico%20pdf'. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=angina%20inestable%20diagnostico%20pdf In PDF document text
    • http://files.kentcrusaders.com/uploads/1/3/0/7/130740193/f916547723c.pdfIn PDF document text
    • http://files.instakats.com/uploads/1/3/0/8/130814680/nufaporigedete_jotim_xuvegerof.pdfIn PDF document text
    • http://files.imagescenter.com/uploads/1/3/0/9/130969545/vemawewasipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3998/0711/files/lizevabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/4th_grade_spelling_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/64342574508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/lonubawejaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/wogix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/mechanics_of_materials_3rd_edition_philpot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/77735118949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8943/6580/files/sikukawagofemabekiwukezi.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 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE4 5144 bytes
SHA-256: 6be3347e11f01d554958e873bbc7e3d85a8662a3f462d3fa44239b2cb3084f25
font_01_sfnt_off00007e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E66 16156 bytes
SHA-256: 1cccf70f59f1b956dc2d0517e7015dc0c45afd096d4628210ea55395dd1405ac
font_02_sfnt_off0000aeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.