Malicious PDF — malware analysis report

Static analysis result for SHA-256 64152a66881c2fe7…

MALICIOUS

PDF

42.3 KB Created: 2020-07-08 16:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 78fede702dac653d6fe72c4576499d3b SHA-1: c27f66f6b72d62efe17a2feeefdcf635ee4900cf SHA-256: 64152a66881c2fe7e200cbb6ea922b7d0507a06518025b66839539d92379f279
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one pointing to a known malicious redirector. The document body and heuristics indicate a link farm designed to direct users to potentially harmful websites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

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/wb?keyword=kruppel%20engel%20summary%20in%20english%20pdf In PDF document text
    • http://files.jfreconsulting.com/uploads/1/3/1/6/131636914/lidezituvegizimoz.pdfIn PDF document text
    • http://files.anniepercussion.com/uploads/1/3/2/7/132740321/disatibe.pdfIn PDF document text
    • http://files.smarttournaments.com/uploads/1/3/1/6/131606674/sodipubulegevofikuze.pdfIn PDF document text
    • http://files.spacemontrose.com/uploads/1/3/0/7/130775744/9035805.pdfIn PDF document text
    • http://files.orangehistory.org/uploads/1/3/1/3/131380998/6a7d3c8e67aa6.pdfIn PDF document text
    • http://files.cisdfoundation.org/uploads/1/3/0/8/130873830/60d3933a79277c.pdfIn PDF document text
    • http://files.nlg-pros.com/uploads/1/3/0/9/130969910/katixiratowapo.pdfIn PDF document text
    • http://files.monasfamilyemporium.com/uploads/1/3/0/8/130873895/2420688e779a2.pdfIn PDF document text
    • http://files.willowwildedges.com/uploads/1/3/1/8/131856443/xukopiwome-tojazelapiz-kasivezobisu-sunezurawuse.pdfIn PDF document text
    • http://files.samtoth.com/uploads/1/3/1/6/131606550/dazigasaguzo.pdfIn PDF document text
    • http://files.becomingsarh.com/uploads/1/3/0/7/130739567/3400932.pdfIn PDF document text
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vosameruki.files.wordpress.com/2020/07/jigir.pdfIn PDF document text
    • https://nogutomat.files.wordpress.com/2020/07/jivuve.pdfIn PDF document text
    • https://rewanuzagi.files.wordpress.com/2020/06/noxotabasugatel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.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_off00006841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6841 5220 bytes
SHA-256: 61b72899606979a114814ea34e1173d2b4668be36ef28f608385d70236da50cf
font_01_sfnt_off000079d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D2 10352 bytes
SHA-256: 49772ceeee3d5b504e2f6c35e7a830cc943d0b4e743331b3837be30b7e3f89ce