Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf5f8db0388d880…

MALICIOUS

PDF

33.8 KB Created: 2020-10-04 15:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c9c2ef6dd98f3f2c71d09ee90bb552d3 SHA-1: f0a0462aae1880767708d7eac062d742873953e7 SHA-256: 5bf5f8db0388d880967b01b619ca1e930868c36c34820f5ed8c2b7894e7fcf66
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a known malicious redirector. The document body, though heavily obfuscated, includes the target URL, suggesting an attempt to trick the user into clicking it. The presence of multiple disposable hosting links further supports a malicious redirection scheme.

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://cctraff.ru/strik?keyword=ciencias+sociales+libro+de+bachillerato+pdf In PDF document text
    • https://site-1037860.mozfiles.com/files/1037860/gogenupufarirufavepoze.pdfIn PDF document text
    • https://site-1040443.mozfiles.com/files/1040443/33663472220.pdfIn PDF document text
    • https://site-1037840.mozfiles.com/files/1037840/47466217860.pdfIn PDF document text
    • https://site-1037866.mozfiles.com/files/1037866/pisekepasanipobek.pdfIn PDF document text
    • http://files.houstoncremm.com/uploads/1/3/0/8/130874265/d55bdca6b.pdfIn PDF document text
    • http://files.communitybaptistcoldlake.com/uploads/1/3/1/8/131871424/9167856.pdfIn PDF document text
    • http://files.berodinwaxcanada.com/uploads/1/3/1/6/131637701/3ce9399.pdfIn PDF document text
    • https://site-1043040.mozfiles.com/files/1043040/24035358207.pdfIn PDF document text
    • https://site-1040683.mozfiles.com/files/1040683/43194763270.pdfIn PDF document text
    • https://site-1041608.mozfiles.com/files/1041608/jatuzopiwazig.pdfIn PDF document text
    • https://site-1040215.mozfiles.com/files/1040215/10761233445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1551/0952/files/zimidozevivadumetegonus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2561/5016/files/busufipawiputolazoxatelox.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_off000043b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43B3 5288 bytes
SHA-256: 537ed4453b5913eb710920b0b044970fd5da97514617aaa403df0d36db95441e
font_01_sfnt_off0000559a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x559A 10704 bytes
SHA-256: 4291952ddc7c1fb662d0f48be1c7ef1aa81be6f818aa4e5e8e55682ee1a7c01c

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