Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdad297e35b602c5…

MALICIOUS

PDF

34.6 KB Created: 2020-10-01 14:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9429fc9ab0203527d2e21ef6eaa02b6d SHA-1: b22684c3c9a5fc06cca5339081c7741701a47dba SHA-256: fdad297e35b602c5a2fa2e006d125e7cd9e9f0b4461d2a8ebb70517d18dbde7d
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that mirrors the lure of free guitar lessons, suggesting a phishing or scam attempt. 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://ggtraff.ru/strik?keyword=beginner+electric+guitar+lessons+pdf In PDF document text
    • http://files.detoncho.com/uploads/1/3/1/3/131378993/ramobi_xirenubopewudu_nitinobedafu_wobobunalatob.pdfIn PDF document text
    • http://parisudop.securevisionmediasolutions.com/uploads/1/3/2/6/132680835/rufavanav.pdfIn PDF document text
    • http://files.vividpac.com/uploads/1/3/0/9/130969446/dusaz.pdfIn PDF document text
    • http://files.gcriverafoundation.org/uploads/1/3/0/8/130874102/zekofubebof-miwuwemu.pdfIn PDF document text
    • http://files.dancetothink.com/uploads/1/3/1/4/131453924/c82fd88.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/1931135093.pdfIn PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/59411768750.pdfIn PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/56163546950.pdfIn PDF document text
    • https://site-1038490.mozfiles.com/files/1038490/67678883502.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/1/0432/7564/9180/files/quick_and_dirty_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1372/9187/files/98831421608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/bikobov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2546/6279/files/pugepuvoxerezofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6adbfbc-7687-42f4-a403-e28c050753c6/volewafowoworinoki.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_off00004ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB1 5372 bytes
SHA-256: b28ac657e18c726e2757b689c6647a66822317f07b463894656ee3d5cff1ee49
font_01_sfnt_off00005d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08 9636 bytes
SHA-256: 7c79954265c7986e7ec1274afb1f239f8198239ab4856b7a30beae6247e0b4b6

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