Malicious PDF — malware analysis report

Static analysis result for SHA-256 3520a6fccb371bfe…

MALICIOUS

PDF

48.1 KB Created: 2020-10-01 19:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 82a34c62f89219208e26c5bcbafdea4d SHA-1: 239543a074e49e17ee8f621fb013807ef1a452ac SHA-256: 3520a6fccb371bfeec0abd58846d443a5249c3643435261b71b751590ec787db
194 Risk Score

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://cctraff.ru/strik?keyword=sleeping+beauty+waltz+piano+pdf In PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/12504006764.pdfIn PDF document text
    • https://site-1037884.mozfiles.com/files/1037884/vinufomumudogilenujotew.pdfIn PDF document text
    • https://site-1036735.mozfiles.com/files/1036735/jexulukesusomafa.pdfIn PDF document text
    • http://files.sweetspotstrategies.com/uploads/1/3/1/3/131384340/7641531.pdfIn PDF document text
    • http://files.realisto.net/uploads/1/3/1/1/131164446/9004630.pdfIn PDF document text
    • http://dopareka.hendricksfit.co/uploads/1/3/0/7/130738854/afdf5fa7aab.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://uploads.strikinglycdn.com/files/5f1c1f1f-308c-4e57-b540-b5f52b550776/direjedifogof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69349881-a2c6-4c66-bb08-639cbdf7b1bf/finodanaxolaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9016dcc6-b05c-4d64-8356-8d85ed2f080f/lowofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a552e20-89e7-490a-aabc-dd1285d6294f/35116856826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a96c234-1a15-461b-82a3-de6e74119683/21201782761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce85bc19-588e-4fac-b551-f8656fd9e1ce/23280148319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8445af82-31d7-4997-971e-d67e5552f1dd/foxebirevobukorat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78442180-3998-4d67-b5d0-f0dfdbcd302b/19247764485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a8ad63-8478-4774-bc43-7760f495084c/13710912864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31df517d-fcc5-4e68-b651-f018e4b44570/62194252858.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6C 5304 bytes
SHA-256: c187c7f79cff661bac427796e520b562a84b19895eeff4b261cce251429aaf6e
font_01_sfnt_off000081a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A5 10320 bytes
SHA-256: be2cd3bcf4676a6297666649a95435e156dce7f628fdf9aa75b0332fcbe31e02
font_02_sfnt_off0000a4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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