Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b23ee208397332e…

MALICIOUS

PDF

73.9 KB Created: 2020-10-12 11:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fbecc46a2b3c2974875f14203c134812 SHA-1: 613e720c98a61aecd11726f12b9fd6d9afe9f17e SHA-256: 2b23ee208397332e5b3749c7e5da65507a954cf4fa69eb255d9a14940fb2f936
184 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and redirector services, indicating a link farm designed to distribute malicious content. One prominent link redirects to 'ttraff.ru', a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise the true nature of the document as a physics PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.ru/pify?keyword=introduction+physique+quantique+pdf In PDF document text
    • https://site-1037827.mozfiles.com/files/1037827/nemuviliguminekag.pdfIn PDF document text
    • https://site-1038955.mozfiles.com/files/1038955/89835063282.pdfIn PDF document text
    • https://site-1038605.mozfiles.com/files/1038605/xosoganewudurilaxulogomu.pdfIn PDF document text
    • https://site-1040434.mozfiles.com/files/1040434/50127001767.pdfIn PDF document text
    • https://site-1036756.mozfiles.com/files/1036756/87655311464.pdfIn PDF document text
    • http://jemevafiw.kringlescreations.com/uploads/1/3/0/9/130969542/relubozematixaforig.pdfIn PDF document text
    • http://files.instantcleaningservice.com/uploads/1/3/1/4/131437044/5dc9cf.pdfIn PDF document text
    • http://dijam.mariannezarzana.com/uploads/1/3/1/4/131452942/doromobarexalifi.pdfIn PDF document text
    • http://files.conservationcollective.shop/uploads/1/3/2/6/132680949/2370342.pdfIn PDF document text
    • http://files.ps50.nl/uploads/1/3/2/6/132696580/7000510.pdfIn PDF document text
    • http://vabaloz.utahmicroloanfund.org/uploads/1/3/2/7/132741181/labipoxapoxedodidi.pdfIn PDF document text
    • http://files.mrscarruthers.com/uploads/1/3/2/8/132814618/nokenu_nabin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8360/0550/files/xirugaxudiginupotuwikusiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/9440/5023/files/16879325285.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 5376 bytes
SHA-256: 806f1f2328b7d1d847c4950dfd918ac80c54451a8014c6e4ed8e3639237d10b2
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 11292 bytes
SHA-256: b7ac8cda03b1a767cf377d333529838fec498c4da7f83db29c5aea27f676c420

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