Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffc3cde6e8aa9df…

MALICIOUS

PDF

37.6 KB Created: 2020-10-03 22:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7688569ebdb1d9b482e5780a67d2efbe SHA-1: f26d9d6cdbf3bcbd5a232f58ab38822995e25d11 SHA-256: 7ffc3cde6e8aa9dfc13d7dbfc89d740f0c48261c0484afc44c7917fb42b9a9f7
124 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially garbled, contains the string 'Formato incapacidad imss 2018' and a URL, suggesting a lure to trick users into clicking. The presence of multiple links on disposable hosting further supports a malicious intent, likely to distribute malware or conduct phishing.

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://gettraff.ru/strik?keyword=formato+incapacidad+imss+2018 In PDF document text
    • https://site-1038321.mozfiles.com/files/1038321/47471917300.pdfIn PDF document text
    • https://site-1041079.mozfiles.com/files/1041079/nevafiv.pdfIn PDF document text
    • https://site-1039877.mozfiles.com/files/1039877/tunazumutuwujigo.pdfIn PDF document text
    • https://site-1037282.mozfiles.com/files/1037282/55213072152.pdfIn PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/wepolozaforokare.pdfIn PDF document text
    • http://bolamepas.alcdance.com/uploads/1/3/1/3/131398379/07ceac42.pdfIn PDF document text
    • http://files.gratefulglass.net/uploads/1/3/0/7/130740622/kumokutovutesosevo.pdfIn PDF document text
    • http://files.parishoflongpointbay.com/uploads/1/3/1/4/131483719/a041169fd85.pdfIn PDF document text
    • http://files.bensonelectric.com/uploads/1/3/1/3/131383674/161b1a.pdfIn PDF document text
    • http://befuzutab.krugerconstruction.net/uploads/1/3/2/6/132681910/657ea0.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/1/0500/2500/5206/files/54629852062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4667/4330/files/ruwipozirazixine.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_off0000516a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x516A 5660 bytes
SHA-256: b7a0384de69d0ad270d400311f98c0654f4bdf268df26e6b1d1b889bd9495065
font_01_sfnt_off00006492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6492 10988 bytes
SHA-256: 079372f4e680c4e29d72d6196596f433c392acb2c1fac30508b1ff639eb53ddd

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