Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba959f586ff3feb8…

MALICIOUS

PDF

32.5 KB Created: 2020-09-30 08:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8372d71c7204d3199ab449a36f61be46 SHA-1: 5fee1601d123e64e2e3c1716fe4c23e63484b1ea SHA-256: ba959f586ff3feb89293c16cf3a0df6762264d881638b0ecaf3a8e199f9428fa
192 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable hosting. One URL, https://cctraff.ru/strik?keyword=anandamela+pujabarshiki+pdf+download, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure and content suggest it's designed to manipulate search engine results or distribute further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=anandamela+pujabarshiki+pdf+download In PDF document text
    • http://sumiw.cachevalleyresources.org/uploads/1/3/1/6/131606349/tonapemixez.pdfIn PDF document text
    • http://jeruzug.ttpa.us/uploads/1/3/1/0/131070227/lidenebamudos.pdfIn PDF document text
    • http://nelirux.nicholselectrical.org/uploads/1/3/1/0/131070867/22f2df183e829a4.pdfIn PDF document text
    • http://vegujote.alliancebulldogs.org/uploads/1/3/2/7/132740850/5992047.pdfIn PDF document text
    • http://files.jasoncoxacupuncture.com/uploads/1/3/1/6/131606487/xetojikime.pdfIn PDF document text
    • http://files.marylandsoups.com/uploads/1/3/1/4/131406372/nigawavili.pdfIn PDF document text
    • http://darunupep.realestatehelm.com/uploads/1/3/2/7/132711949/dofuseg.pdfIn PDF document text
    • http://files.robohawks1985.org/uploads/1/3/1/3/131378814/bijabogewajewo.pdfIn PDF document text
    • http://kifuzepo.en.guacamaya.info/uploads/1/3/0/8/130874422/movipop.pdfIn PDF document text
    • http://files.metafarms.com/uploads/1/3/1/6/131606395/8355531.pdfIn PDF document text
    • http://files.irenepruitt.com/uploads/1/3/1/6/131637306/wajileda.pdfIn PDF document text
    • http://files.gypsydenisse.com/uploads/1/3/1/1/131164488/sizoveluniwedaxufaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000041e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41E8 5640 bytes
SHA-256: 5112a85f05e04f71d33e1a1a1781b9ca2077c0f46fa6d9f09d4cd0fe4d2eb24d
font_01_sfnt_off000054f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54F2 9572 bytes
SHA-256: f571825d862a7da1551119b5921177c694dcf4e0c1a1ba03dff8f48c89a1d74f