Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8efa25ca879d26d…

MALICIOUS

PDF

36.5 KB Created: 2020-10-26 22:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e0b2225a5d897c3b4d961bfd9043e2a8 SHA-1: e5a569a37d571737df8ef286331855a5afe2cdd0 SHA-256: b8efa25ca879d26d14c64c4962ce0cc4e952d8b8e7186317f2521cf4adef4eba
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to a known malicious domain, ggtraff.ru, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a link farm designed to distribute malware. The ML classifier also strongly indicated maliciousness.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=chapter+3+molecules+of+life+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5f946cfade982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5f8c6269a0f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f896fe101e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5f92c5a622721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8927c0dfa10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f96304f6421d.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/kepewenofasobowakos.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/6138711.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/zemevozafax_fureto_duxenijirumip.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wewebunovemerifabo.pdfIn PDF document text
    • https://paviliwele.weebly.com/uploads/1/3/4/4/134489687/a01b7cefbb68.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/bulolimepol/wings_of_fire_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/19537799602.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/bloch_theorem_proof.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/86880638187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2815/9381/files/suzulagudog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2743/0059/files/63501864861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5640/6940/files/astro_van_size.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8534/1896/files/alan_watts_wisdom_of_insecurity_epub.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE8 5480 bytes
SHA-256: 7dd3eff11386a68e4b7f32d44d4dd296550978827bc99bea731c092e1ef38d78
font_01_sfnt_off00006080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6080 10552 bytes
SHA-256: 31253da5c0d59fed680cc0d153d87ddce09c505796be72dfea7c96472fe907be

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