Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3868c0b17c9dff2…

MALICIOUS

PDF

48.2 KB Created: 2020-09-30 05:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a43350bc40895dabae4e9a7f31119081 SHA-1: 3902d72a08410547cc021f22320c45f1cf2b0daa SHA-256: f3868c0b17c9dff23f0ec604b2a68bfe99437227d0bcdb4d0924bfbcca6a9895
124 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure to trick users into clicking malicious links. The ML classifier also strongly indicated maliciousness.

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=fatores+de+risco+cancer+de+pulmao+pdf In PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/94782646729.pdfIn PDF document text
    • https://site-1037191.mozfiles.com/files/1037191/82813179110.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/bepeminetax.pdfIn PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/69186863070.pdfIn PDF document text
    • https://site-1037005.mozfiles.com/files/1037005/9771487712.pdfIn PDF document text
    • http://files.midwestalliancesoccer.com/uploads/1/3/0/7/130740252/bevilur.pdfIn PDF document text
    • http://ziwuxo.sronewsletters.com/uploads/1/3/2/6/132680869/vugewazixamazisebuxa.pdfIn PDF document text
    • http://bagoguxeb.dugymrg.com/uploads/1/3/1/3/131380344/9106938.pdfIn PDF document text
    • http://files.merkconstruction.com/uploads/1/3/1/3/131398094/jarirezokuwawufugiv.pdfIn PDF document text
    • http://rubanufe.keystothekingdomofheaven.com/uploads/1/3/0/7/130775610/nimek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c733b9-2d38-4c65-9a81-f1227be5ce69/52054022006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0375cf22-15b4-48bd-acfa-ab6cb200aeaa/juragoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/jegitopuvedufipaxorag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9453/1486/files/kajenimiwurineta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/asoftech_data_recovery_full_version_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6576/0151/files/62154594432.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_off00007afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFA 5256 bytes
SHA-256: fb048b2412b33b953a8a1d4f15fd5fff1b0bf4d87d3b525f4cff36526bca4d6a
font_01_sfnt_off00008cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC9 12416 bytes
SHA-256: 4809442c061c0dacc9bf88fbdc7c51375388a582d9d6a737084bd3030ad462d3

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