Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e3901928c1029f…

MALICIOUS

PDF

40.3 KB Created: 2020-10-11 07:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 54f2a4609797b9ea19c53845afac236c SHA-1: eb8896f5205a4bd59a6981d035d45a6023540027 SHA-256: 23e3901928c1029fa90ed7554ddb41865d5f68c308f62f1714dcb256e457e4f0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to other PDF files hosted on disposable or potentially malicious domains. One URL, 'https://cctraff.ru/strik?keyword=double+cross+worksheet+129', is identified as a malicious redirector, indicating a likely attempt to lead users to malicious content or phishing sites. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=double+cross+worksheet+129 In PDF document text
    • https://site-1039837.mozfiles.com/files/1039837/xenigozulotenokojinus.pdfIn PDF document text
    • https://site-1039931.mozfiles.com/files/1039931/10919278291.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/nogogiramigeno.pdfIn PDF document text
    • http://files.newportnewslinks.org/uploads/1/3/0/7/130775516/gexuropex_wapigozinalanem.pdfIn PDF document text
    • http://litobofu.southmadisonunite.org/uploads/1/3/1/4/131409236/tamirodetew.pdfIn PDF document text
    • http://puveserif.nicolasdogwalkingservices.com/uploads/1/3/0/9/130969600/5929549.pdfIn PDF document text
    • http://files.iaymyouth.org/uploads/1/3/0/8/130814935/zudopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ec6c78-5413-4cb8-adf4-4197547f71d7/1398866011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9e3298-ac80-4b26-99ae-6a8013db8114/zonesivisova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/dalotemaxotapezadev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/what_would_your_moms_cousins_daughter_be_to_you.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_off000060b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B2 5312 bytes
SHA-256: 2a345fe0f6c95e4e1c4e2dd4b8aff80ff69e6a5e415854df46616d682ece60cf
font_01_sfnt_off000072d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D5 10032 bytes
SHA-256: e36cf971558485df26bd26df8027324222272697811da045cbf8e429e7577dbb

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