Malicious PDF — malware analysis report

Static analysis result for SHA-256 b131ce4cc950b2f9…

MALICIOUS

PDF

51.1 KB Created: 2020-10-03 16:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8992e1bd7e63d5fa3093b2d033c74098 SHA-1: ed8234037fc0a3a609e546f70e2a5361d688e9aa SHA-256: b131ce4cc950b2f9e3490db860fab44a6d3a68f7d8ba5f988b2733645189ad11
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to redirector infrastructure. The primary redirector URL is https://gettraff.ru/strik?keyword=the+portrait+of+dorian+gray+summary+by+chapters, which is flagged as malicious. This indicates the document is designed to lure users to malicious sites, likely for further exploitation or phishing. No scripts were extracted from this sample.

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/strik?keyword=the+portrait+of+dorian+gray+summary+by+chapters In PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/57570074083.pdfIn PDF document text
    • https://site-1037079.mozfiles.com/files/1037079/61601351574.pdfIn PDF document text
    • https://site-1041695.mozfiles.com/files/1041695/80031099017.pdfIn PDF document text
    • https://site-1038975.mozfiles.com/files/1038975/fapadexarunon.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/xubozirubadi.pdfIn PDF document text
    • https://site-1041090.mozfiles.com/files/1041090/83330581261.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/wimidaporil.pdfIn PDF document text
    • http://pawor.jaxburgoyne.com/uploads/1/3/1/8/131856543/nekekofi.pdfIn PDF document text
    • http://files.frozenmomentsintime.com/uploads/1/3/0/8/130813118/nevutuforemeru.pdfIn PDF document text
    • http://karusile.crowsnestht.com.au/uploads/1/3/1/3/131379594/sazuvud_marawetutosi_banimi_jasolus.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/1/0435/6790/6975/files/76447377131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7582/4544/files/85856855348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9564/9175/files/besagugagedakegibeguz.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_off00008896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8896 5728 bytes
SHA-256: d6c3419177b7c0bd8b67682e8518612d2b74d9029bb98886b53824384ac2b4bf
font_01_sfnt_off00009bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF3 10424 bytes
SHA-256: c32b59458f61865343c8e5f2468f6cb15b3cb85cd8ecde4b43e67ed31ea1cd0e

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