Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b259a195e7fd80e…

MALICIOUS

PDF

46.7 KB Created: 2020-10-03 18:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8c71b686d31cad2624a29d07f1d0f5e1 SHA-1: 7f082c5f7852eed5729afb09e2ce2ebb91f7fb24 SHA-256: 1b259a195e7fd80e682aa3884d3c6f6488c60103b1fee7e409a78866aaa3ca9d
124 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=what+a+beautiful+name+pdf'. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=what+a+beautiful+name+pdf In PDF document text
    • https://site-1037075.mozfiles.com/files/1037075/roxakofojuranuve.pdfIn PDF document text
    • https://site-1042889.mozfiles.com/files/1042889/girosaxi.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/98230314632.pdfIn PDF document text
    • http://files.cpang-architects.com/uploads/1/3/1/6/131606348/kedezu.pdfIn PDF document text
    • https://site-1037143.mozfiles.com/files/1037143/wiviwu.pdfIn PDF document text
    • https://site-1040249.mozfiles.com/files/1040249/dugarawaw.pdfIn PDF document text
    • https://site-1038649.mozfiles.com/files/1038649/24125174186.pdfIn PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/36515224399.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://cdn.shopify.com/s/files/1/0484/6940/9946/files/95128942587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3193/2311/files/bloodborne_old_hunters_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/cricket_hollow_zoo.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_off00006b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7E 4932 bytes
SHA-256: 6a067e322f2823fada67ca1860ae423b3928e57d781d401dc07a20d5bd594e76
font_01_sfnt_off00007c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1B 10460 bytes
SHA-256: 39e47d4b94f25d4fb2edbdd9eb934cfdd6f1ee07c347a807c51d7d897507caf9
font_02_sfnt_off00009fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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