Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f228bc030230a67…

MALICIOUS

PDF

34.2 KB Created: 2020-10-07 12:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d2ad6d7f8d14e789a924cd24e2a4d494 SHA-1: e5ec885797fec48ae4038d349d08e1a033df16e9 SHA-256: 4f228bc030230a6712db900a4b3b2734f84609284137428f5dcde69af41e7a4a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to disposable hosting domains and a known malicious redirector. The document body, though partially corrupted, contains text related to a Michelin guide and restaurant search, likely serving as a lure. The primary malicious activity observed is the redirection to external, potentially harmful, URLs.

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=restaurant+mulhouse+guide+michelin In PDF document text
    • https://site-1042359.mozfiles.com/files/1042359/20623061927.pdfIn PDF document text
    • https://site-1038777.mozfiles.com/files/1038777/4831165434.pdfIn PDF document text
    • https://site-1039503.mozfiles.com/files/1039503/kigogigubum.pdfIn PDF document text
    • https://site-1039456.mozfiles.com/files/1039456/13948868376.pdfIn PDF document text
    • https://site-1040289.mozfiles.com/files/1040289/sawegatefenel.pdfIn PDF document text
    • http://files.haylingchristiancentre.org/uploads/1/3/1/6/131637774/wamanogasawefir.pdfIn PDF document text
    • http://files.mariajohannsen.com/uploads/1/3/2/8/132815365/d21cf71c07b002.pdfIn PDF document text
    • http://nilesofis.storyandspirit.org/uploads/1/3/1/0/131070450/rejarerojenepev.pdfIn PDF document text
    • http://tirujud.cascadiayouthmentalhealth.com/uploads/1/3/0/7/130739415/jonududenego.pdfIn PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/13514210502.pdfIn PDF document text
    • https://site-1037849.mozfiles.com/files/1037849/dekikum.pdfIn PDF document text
    • https://site-1043829.mozfiles.com/files/1043829/guzuzirogu.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/57137234885.pdfIn PDF document text
    • https://site-1038743.mozfiles.com/files/1038743/21796508906.pdfIn PDF document text
    • https://site-1041212.mozfiles.com/files/1041212/mukoxamegol.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_off0000491d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x491D 5360 bytes
SHA-256: cf04cc279856701c98823bc024ee188d89345e451331c7e8e5614c5130d7a233
font_01_sfnt_off00005b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2B 9616 bytes
SHA-256: 9a2dd6964cf83cc0ea4e4b67906ca0a7d1b6ef0ec8ef3d36bf3b74c8c6f0f0a7

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