Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4fbee551343959…

MALICIOUS

PDF

91.5 KB Created: 2020-10-12 13:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d573bbcc6f5d2515945f8a63fbbd7ee9 SHA-1: 92997636cb57ce99194cc8feaa6bcfc53afe0e4d SHA-256: fc4fbee551343959612f93018e77c241dc735c20687402b6d49549b4e441ea7d
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the redirector, suggesting the primary purpose is to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=o+come+to+the+altar+lyrics+pdf In PDF document text
    • https://site-1036689.mozfiles.com/files/1036689/jomugesal.pdfIn PDF document text
    • https://site-1042191.mozfiles.com/files/1042191/serokubazopagovuxu.pdfIn PDF document text
    • https://site-1043853.mozfiles.com/files/1043853/27881632318.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/tuwanibotafaxajojejolupuk.pdfIn PDF document text
    • http://files.whitemountainsranch.org/uploads/1/3/1/8/131871650/886875c18b7.pdfIn PDF document text
    • http://levosogap.glennhousevr.com/uploads/1/3/2/7/132740930/2080770.pdfIn PDF document text
    • http://files.alises-bakery.com/uploads/1/3/1/4/131453432/5269184.pdfIn PDF document text
    • http://files.adentabenelux.com/uploads/1/3/1/3/131379113/gavilivisozo.pdfIn PDF document text
    • http://files.eaglecreekwinery.com/uploads/1/3/1/6/131606197/jipapez_peximinojub_ragenuwe.pdfIn PDF document text
    • http://nusoxod.greenvilleairbnb.com/uploads/1/3/1/6/131606349/8022400.pdfIn PDF document text
    • http://zekone.oxfordcountyhouseclearance.co.uk/uploads/1/3/1/8/131856570/29eeafd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61c7550-fce1-4443-a072-2f96820f3710/lulowisazilupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b789a3d8-fdda-406d-bf3f-d230f1aa52af/jijeredekif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4109bf3f-ccd1-4c02-a433-24d8d81b12d9/nafajivevugajilofux.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 5524 bytes
SHA-256: 99d62279719af6f31aa77e3292b8747e8fb90562fcdef343a4df60c250db3b39
font_01_sfnt_off000127f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 10116 bytes
SHA-256: 39223e5014dfbc62047b58fec5bfc1e46da7562867b0a46ed6c29e63bded1551
font_02_sfnt_off00014acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACD 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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