Malicious PDF — malware analysis report

Static analysis result for SHA-256 3983fb11751dd628…

MALICIOUS

PDF

62.8 KB Created: 2020-09-30 20:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb998fa32afaae45c605aded2031ba4b SHA-1: 717e7e1fb513cbdbdd31f1ac145a07ca01c46cc8 SHA-256: 3983fb11751dd6280b91a94e9335ac96b4c861c3f4900a6295b802ce8fd82267
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple embedded URLs, with a primary redirector identified as 'https://ggtraff.ru/strik?keyword=cardiopathie+cong%25C3%25A9nitale+pdf'. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting further supports this. The document body, though heavily obfuscated, contains the same lure text and the malicious URL, suggesting an attempt to trick users into clicking through to a malicious site.

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=cardiopathie+cong%25C3%25A9nitale+pdf In PDF document text
    • https://site-1036881.mozfiles.com/files/1036881/xobifojidul.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/46532204731.pdfIn PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/wajozub.pdfIn PDF document text
    • http://files.thgrill.com/uploads/1/3/1/6/131606094/zumusupawome-pamotobimudivam.pdfIn PDF document text
    • http://files.zoiecalladesigns.com/uploads/1/3/0/7/130775143/safalifapevuf.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/zifegedimuvekolup.pdfIn PDF document text
    • https://site-1037101.mozfiles.com/files/1037101/liwobijofekonilinabelu.pdfIn PDF document text
    • https://site-1036807.mozfiles.com/files/1036807/67114906000.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/rixusojuzis.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/noxotifanogaju.pdfIn PDF document text
    • https://site-1037028.mozfiles.com/files/1037028/83585596985.pdfIn PDF document text
    • https://site-1036993.mozfiles.com/files/1036993/25159713309.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8554 5192 bytes
SHA-256: 3bd4ac7700ceaf6f116cb2c9e6cc26e8fa6dc99b99858ae5ec99e6322dc30e95
font_01_sfnt_off000096b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96B7 16724 bytes
SHA-256: 652d7e3f062ae49495b1d8d371dee22b92d8c740372177de1ee70b2796f54173
font_02_sfnt_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 16148 bytes
SHA-256: 6c7705833fc3965cf0662333d51f993da4a743600ebe3aa3d6a9f423e004df0b
font_03_sfnt_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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