Malicious PDF — malware analysis report

Static analysis result for SHA-256 335663fd2edcb9a9…

MALICIOUS

PDF

33.7 KB Created: 2020-09-30 06:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8242b0f8b37a4cc5ae41bf828004b562 SHA-1: d1867c67ee9ac1387285465e607ea927eb41a027 SHA-256: 335663fd2edcb9a948a3ca6b38a71b28b8d193a5d55c22fe2227daad4656d86a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to academic content and URLs, suggesting a lure to disguise the 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=introduction+to+marine+biogeochemistry+pdf In PDF document text
    • http://files.absolutegraphixink.com/uploads/1/3/0/7/130739892/565920.pdfIn PDF document text
    • http://files.gamlahusid.com/uploads/1/3/2/7/132712006/kaxomeperewosu-lusonegu.pdfIn PDF document text
    • http://files.simplicitysalonanddayspa.com/uploads/1/3/1/3/131398334/gesivejomoduxar.pdfIn PDF document text
    • http://files.marketingbycat.com/uploads/1/3/1/4/131483336/zatewij.pdfIn PDF document text
    • http://files.paigeeverson.com/uploads/1/3/2/3/132302859/feduwokaxomomadip.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/39921390514.pdfIn PDF document text
    • https://site-1037844.mozfiles.com/files/1037844/48433302529.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/63646372992.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/42589459594.pdfIn PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/26726589035.pdfIn PDF document text
    • http://figukoja.morichmoments.com/uploads/1/3/2/6/132683078/5fb5dc077ff1.pdfIn PDF document text
    • http://fubibite.enipma.com/uploads/1/3/2/7/132741099/dosob_vozamurewer_gewip_rawew.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/mezivajebelakomojinew.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/83596899711.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/86962694603.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/vozuw.pdfIn PDF document text
    • https://site-1036744.mozfiles.com/files/1036744/31563428436.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_off0000470f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x470F 5716 bytes
SHA-256: a8ce73338f095fb73571cde2a04d2ca388c7c0f97c44058ac5d4dbe349b6b1a3
font_01_sfnt_off00005a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A57 9412 bytes
SHA-256: 9d64e4005bee68ebc298b16842aead7102f06c687966e7f9f9cb17ac61727998

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