Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52bbc41c9175de1…

MALICIOUS

PDF

99.8 KB Created: 2020-09-12 05:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5658e12fe4519b6326cd3155b2452c55 SHA-1: 2b32025b07eb6723ae9259d449e6b143d952ecc0 SHA-256: d52bbc41c9175de129eb00f1ab6db7e4994ba2ea7396a6d7d3a0ab99e22c3d4f
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure malicious activity. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=advanced+life+support+manual+6th+edition'. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=advanced+life+support+manual+6th+edition In PDF document text
    • http://files.comoxvalleyringette.com/uploads/1/3/2/6/132695280/betadus_morozog.pdfIn PDF document text
    • http://sugawukiw.krollpatrol.com/uploads/1/3/0/8/130814328/2143717.pdfIn PDF document text
    • http://files.peakposse.com/uploads/1/3/1/4/131453194/kabozaxofibop_gedanamizu_sasesoxevufedap.pdfIn PDF document text
    • http://files.joannawhiteflute.com/uploads/1/3/2/7/132740692/5552278.pdfIn PDF document text
    • http://files.matthewrochford.co.uk/uploads/1/3/2/3/132303035/b524e04.pdfIn PDF document text
    • http://files.livinglightwellness.com/uploads/1/3/0/7/130739883/lotimetewasol.pdfIn PDF document text
    • http://peweta.davidgaffney.org/uploads/1/3/1/3/131383949/9070045.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/1/0430/6557/3537/files/amleto_riassunto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/bcom_1st_year_books_in_telugu.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ab63e3_df86f9c22f4849d3a01cf5bcf7f05de6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cc15ef_716bf27ea417484cad1a65d1115619f8.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_off00014551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14551 5600 bytes
SHA-256: 403735d05622ec5dc2ad3fe3de26429b679bf13633da44d8f39d1c6b0460fe7c
font_01_sfnt_off0001583c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583C 12880 bytes
SHA-256: c992f40f2557b4695b0d244a3f16e76dfe70934867a66eda3ff58f032a0af2e2

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