Malicious PDF — malware analysis report

Static analysis result for SHA-256 8211d8903945ce53…

MALICIOUS

PDF

77.6 KB Created: 2020-11-02 12:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 79258fe66d9d12e157763d21a8442151 SHA-1: ee0a492ef9f89fffe06e07df6375c4b5037991c7 SHA-256: 8211d8903945ce539246d8c4b66f84946e630382ebaa8ae1da94fb441f2abdbb
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=town+of+waltham+mass`. The ML classifier strongly indicated maliciousness, and the presence of redirector links suggests a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded URLs are sufficient to infer a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=town+of+waltham+mass In PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/e45bdeeb4f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5f9eb89cb73e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f965f772e26d.pdfIn PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/98e6428979c0.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/junurazotanes_guwuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5f959de95f0ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5f9459df95f11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5f8c921c585dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8cf5a74f92f.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/kolavurora-jakugononerizaw.pdfIn PDF document text
    • https://somisesi.weebly.com/uploads/1/3/4/5/134523690/mudadumevosifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/luxejifenilinukupuvol.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 6

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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 3124 bytes
SHA-256: e138df1496d6a3cf0912bc16e285ec97a9cf1bc5e9f1068742723395848f8b98
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 4952 bytes
SHA-256: 1e133360a92bf8a623b61c7027e0d3f77d851248e3ca96bb93d35b44287e0c36
font_02_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 13824 bytes
SHA-256: b24170d7ea4a3ad877db189dd2b1c7fdf867b7628f35905b16285ce7623ad1b3

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