Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff519b6d0f22cb0…

MALICIOUS

PDF

41.1 KB Created: 2020-10-02 06:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 78f575ce672f9684133d540ddf74997a SHA-1: bf49c12b71faeea70798bde7472f7e9d017deb2d SHA-256: bff519b6d0f22cb03e9ce430cac5aa7e9d903c52387d8dd01f5f2cffc98f3705
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains text related to the embedded URLs. The presence of multiple links on disposable hosting suggests a link farm used for SEO poisoning or phishing.

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://ggtraff.ru/strik?keyword=bunsen+burner+parts+and+functions+pdf In PDF document text
    • http://files.therenaissanceinstitute.com/uploads/1/3/0/7/130775320/12206f5b.pdfIn PDF document text
    • http://files.columbusbas.com/uploads/1/3/0/7/130775830/nezevosevavil_lavekari.pdfIn PDF document text
    • http://files.tinyboxofeverything.com/uploads/1/3/1/3/131381542/nitiwe.pdfIn PDF document text
    • http://xeruful.capes4kidsdfw.org/uploads/1/3/0/7/130739349/5760950.pdfIn PDF document text
    • http://files.overhauls.info/uploads/1/3/1/1/131163955/fomadudetofumif_geporokomun_tesumi_linun.pdfIn PDF document text
    • http://files.qualifywithadam.com/uploads/1/3/0/7/130776712/fazodidivina_buwadobura_gowajapabufuf.pdfIn PDF document text
    • http://files.spunglasstheatre.com/uploads/1/3/1/4/131452872/fuzavoxomajasetavo.pdfIn PDF document text
    • http://files.daniellekoupf.com/uploads/1/3/0/9/130969032/kisozibatefipap_wuxukifiz.pdfIn PDF document text
    • http://files.mycoachblack.net/uploads/1/3/1/4/131453610/najisefex.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/d5804edb-13dc-4bf5-bede-016d37b783cb/75274619675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1e47d7-a9d8-4778-b998-b1bf29ff2b88/favozarum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e56cfb-026d-410b-84b9-eb9bb06a68fb/42242319890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1772c3cb-b3c1-4dba-bc19-8976884e29ac/13940221051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b648ef93-1735-4f60-8cb6-6da1f4760fba/39042255178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9fb60bf-0155-4004-b13d-c641926257c5/23365220579.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_off0000635e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635E 5308 bytes
SHA-256: 483432478d0779c8aecce0fdec786726f67e9a27e99999afd0489771d4219826
font_01_sfnt_off00007570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7570 9992 bytes
SHA-256: 22ed6e458f282fe414183599550bb12ef80206dadea054834638da1c1ddf4dad

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