Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca92cfe7e7b3ce50…

MALICIOUS

PDF

49.9 KB Created: 2020-10-30 11:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 29b15c78cb1f675e776c005a266577f7 SHA-1: 2d0ba3155988a0aa0b88c2739acc8759bf28d898 SHA-256: ca92cfe7e7b3ce50f85d753f29b252fd0da73a941906bf87a055d1d566c2d285
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. The presence of numerous external PDF links, including one to 'cdn-cms.f-static.net', suggests an attempt to create a link farm, potentially for SEO manipulation or to obscure malicious destinations.

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://ttraff.com/pify?keyword=rv+shower+curtain+track In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5f8ba9e65c396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_5f987fb0a4dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_5f963fff1da51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_5f9a1e53c4e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f95f7d7cca5b.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/dosapisobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f8b6280c05a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f8c17461a5f5.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/1/0502/4812/2527/files/purple_hull_peas_recipe_with_ham.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/piwazobibiwegoragopa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5079/3658/files/vevaladagejozodi.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_off000077e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E3 4960 bytes
SHA-256: d1dbb8125cda927e82f244a69d9dae12882ff46e1791e96b4ecb74ad0618efe8
font_01_sfnt_off000088d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D3 10636 bytes
SHA-256: 819f9a67ea4187475b8d0cfdad29d6ede93e474a88b872d2cd8218fef2ad5e83
font_02_sfnt_off0000acb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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