Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c2f4660b1570a8…

MALICIOUS

PDF

37.8 KB Created: 2020-10-08 21:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59716d1312fb72c5d4a5e86a98d36194 SHA-1: 3f1953d8b0e02ac639a397d30571ae19d02947c0 SHA-256: b7c2f4660b1570a83938437bc9ec8c61c5a46f2440bc791307e5d3e65a0222b9
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and other suspicious domains, suggesting a lure to external malicious content. 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=apostila+de+artes+para+imprimir In PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/64345805282.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/70464272483.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/50183254280.pdfIn PDF document text
    • https://site-1038803.mozfiles.com/files/1038803/12718865265.pdfIn PDF document text
    • https://site-1039634.mozfiles.com/files/1039634/72255690622.pdfIn PDF document text
    • http://files.shorespices.com/uploads/1/3/2/6/132681517/zogelisaz.pdfIn PDF document text
    • http://files.juliamarieyoga.com/uploads/1/3/1/1/131163693/ruretu_gitafu_jibaxapa_pekowemafibine.pdfIn PDF document text
    • http://kagabovim.elenagadjanova.com/uploads/1/3/0/7/130776783/8607519.pdfIn PDF document text
    • http://vaxamexug.lmbuer.com/uploads/1/3/1/3/131380011/juxavuluboxanir-guzusi.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://uploads.strikinglycdn.com/files/b4437de4-3ba0-44bb-8a88-40e34d54f8e3/numijogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6afe64a1-a148-4e9f-9894-2f360fe3441e/823908773.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_off000046a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46A8 4776 bytes
SHA-256: b364a5f1c0415c1b849be191446abc57376a56e34e9b5f6493b5b897475cf519
font_01_sfnt_off000056da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56DA 11552 bytes
SHA-256: 3e3030fe2a46eef6fc0f85d9645a8fe955c381e9f0117882b45baf730a34bfa8
font_02_sfnt_off00007b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B26 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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