Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b37659b55645148…

MALICIOUS

PDF

42.2 KB Created: 2020-10-08 15:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e64509a8407b42071103dfd65bcf9ac6 SHA-1: 9ed1f438ecafe1ef948bc3c1feed6c6617e7ad7d SHA-256: 6b37659b55645148f627492f57acdb460eb81a7b6336a9f47371ca5329282aec
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to disposable hosting sites, with one prominent link redirecting to a known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'revitol anti aging moisturizing crea' and the malicious URL, suggesting a lure for users interested in such products. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=revitol+anti+aging+moisturizing+crea In PDF document text
    • https://site-1039607.mozfiles.com/files/1039607/tebevofujitinezekovi.pdfIn PDF document text
    • https://site-1042776.mozfiles.com/files/1042776/gukoweb.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/74846029726.pdfIn PDF document text
    • https://site-1039150.mozfiles.com/files/1039150/zabufebagomoverilutim.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/11969845459.pdfIn PDF document text
    • http://files.wenie.net/uploads/1/3/0/9/130969404/bamipedagavuj.pdfIn PDF document text
    • https://site-1037267.mozfiles.com/files/1037267/38185103079.pdfIn PDF document text
    • https://site-1039449.mozfiles.com/files/1039449/17939122711.pdfIn PDF document text
    • https://site-1040008.mozfiles.com/files/1040008/xebojukexogos.pdfIn PDF document text
    • https://site-1039261.mozfiles.com/files/1039261/21008602797.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/23790217404.pdfIn PDF document text
    • https://site-1042355.mozfiles.com/files/1042355/26878383437.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/39920165850.pdfIn PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/zutaxi.pdfIn PDF document text
    • https://site-1038772.mozfiles.com/files/1038772/magewowuzonur.pdfIn PDF document text
    • https://site-1039600.mozfiles.com/files/1039600/48171124486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000668f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 5236 bytes
SHA-256: 59b7793497f7e64ebe8091531d0230a4f12892e3fc87b4eed893818767bd8412
font_01_sfnt_off00007862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7862 10392 bytes
SHA-256: 44bc662d57e99c7c93561c1f9bc65b061aef4b56e007106a28aee842e78eb7d3

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