Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbdcb7856064d6e…

MALICIOUS

PDF

57.4 KB Created: 2020-10-07 03:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8695620ed118dcb8ca63cf40f8899954 SHA-1: 72800e63ebd34f056347203f598a8b94d079d804 SHA-256: fcbdcb7856064d6e47c4011da55392c081650d1278bb8def93cb913c4b678f06
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URLs and appears to be generated by wkhtmltopdf, a tool often used to create SEO link farms. The ML classifier strongly indicates maliciousness, and the embedded links suggest an attempt to redirect users to potentially harmful content.

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 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.
  • 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=treantmonk%2527+s+guide+to+wizards In PDF document text
    • https://site-1038693.mozfiles.com/files/1038693/winedokuleduditugo.pdfIn PDF document text
    • https://site-1039922.mozfiles.com/files/1039922/zesexeluwilukarogududum.pdfIn PDF document text
    • https://site-1043698.mozfiles.com/files/1043698/zopijesitam.pdfIn PDF document text
    • http://mikagado.jennybirmelin.com/uploads/1/3/2/3/132303072/26747c1b22.pdfIn PDF document text
    • http://gapuf.josemleyva.com/uploads/1/3/1/4/131452922/finipizevis.pdfIn PDF document text
    • http://files.guono.org/uploads/1/3/1/4/131482812/finufubusaxuwa-tutid-tuzepawalurudor-silavudex.pdfIn PDF document text
    • http://bozexoxul.sja-cpgessex.org/uploads/1/3/1/3/131379737/fovemabar.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/1/0431/8140/8416/files/soguziloxefumaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2131/0880/files/the_giver_chapter_8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7709/9939/files/nofazevazopuvuwubomipafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/fiwul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4183/2615/files/22239205411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2086/1092/files/black_keys_tighten_up_tab.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_off0000a201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA201 5304 bytes
SHA-256: 7d8fbb1a12cdc301646e9bc29c1b6a6768a2a0b3bef993e83e27b0f26a429f0e
font_01_sfnt_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 10680 bytes
SHA-256: f9f359745beda9d66cc10a082a18a0ababf5d9020580e95f0bab1cf38545604f

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