Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8125d82d55e32fe…

MALICIOUS

PDF

44.4 KB Created: 2020-11-02 04:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc4a571b803c8600435ba50a4746b263 SHA-1: 1a9d977cce4b8eacb203c1b10c7aaf0e0fee6364 SHA-256: e8125d82d55e32fe9a67bd1277ae27287ea485a596e9ffd5dc0963c18cf6b285
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, potentially for phishing or malware distribution.

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.
  • 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://gettraff.ru/aws?keyword=hud+asset+calculation+worksheet+excel In PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/9006020.pdfIn PDF document text
    • https://virebutonoku.weebly.com/uploads/1/3/4/4/134486614/koxid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5f98c41a340d3.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/2642778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5f8d444f1dfd2.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/nixobisad-denurasuke-sadomos-jixovireziwevak.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/3307262.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/605c5ca1.pdfIn PDF document text
    • https://saxuvelimeno.weebly.com/uploads/1/3/4/4/134480096/kuxetedoxovuwutoroz.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/goxipogukole-fatoxuna-moweriwub-rumapovowow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5f985ee7a32ad.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/donarepemi/the_pact_book.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_off0000704c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704C 5212 bytes
SHA-256: eb91d587b5bd553f4e4bdde93905d46eff653a23942fd43729ab5917534288d7
font_01_sfnt_off00008211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8211 10208 bytes
SHA-256: 17bdbbe7021c6e8137f9830ad24f21d72073a31aff1a9aa2cc1272b0a1e79955

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