Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33e518042999733…

MALICIOUS

PDF

45.2 KB Created: 2020-09-30 18:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3ab8946bfd430fe5af84b9fc1621ed0 SHA-1: dce7b39735327deec6c4934ea41f4f0cbedefb0c SHA-256: e33e518042999733666ae66d094c19a30fc7018411267aaf23d271840f9c1c38
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or SEO spam tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body, though corrupted, contains text related to a worksheet and a URL that matches the malicious redirector, reinforcing the lure.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/strik?keyword=symmetry+worksheet+for+grade+4+pdf In PDF document text
    • http://sezit.wimfoxvalley.org/uploads/1/3/1/3/131379256/6017276.pdfIn PDF document text
    • http://files.stcfministry.com/uploads/1/3/0/7/130739674/tisilefez_xoxivobawulidij_tibise_nozewu.pdfIn PDF document text
    • http://kasokune.betterremindersapp.com/uploads/1/3/2/3/132303229/nefizepibobep_saxomurem_noxejegepuzat.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/pinizadekaxolanofux.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/15787474826.pdfIn PDF document text
    • https://site-1037906.mozfiles.com/files/1037906/lawumed.pdfIn PDF document text
    • http://xegoxarud.asqfortworth.org/uploads/1/3/2/7/132710635/7462424.pdfIn PDF document text
    • http://files.paulajunn.com/uploads/1/3/1/8/131856949/pikulutetukit.pdfIn PDF document text
    • http://files.tavernegoudenpunt.be/uploads/1/3/2/6/132681194/dasagozunonapodeve.pdfIn PDF document text
    • http://fatitu.nucoonrizn.com/uploads/1/3/0/7/130738714/7238876.pdfIn PDF document text
    • http://files.rockybutteslides.com/uploads/1/3/1/3/131381605/3290858.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
    • https://cdn.shopify.com/s/files/1/0461/3698/3720/files/responsibility_accounting_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8414/2997/files/public_finance_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/6260/8280/files/jinunasotoradukumijawow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6937/9238/files/20959777126.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E6 5504 bytes
SHA-256: 6e6bd9d891ce5aba50fb0539d3f4f2c77c11b1d6228e63c5c4dcd1dbfab58aab
font_01_sfnt_off000076ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76BA 10300 bytes
SHA-256: c8ca7517772c516338a2fae6a8371e55eed3915cdbe0fae9a442d51c1ef206b6
font_02_sfnt_off000099ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99AC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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