Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab9a68b131c77c9…

MALICIOUS

PDF

66.3 KB Created: 2020-10-19 06:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 63dfebebba7b51c6bde8ed0ed20acfb2 SHA-1: fda4f21d1a82d92bf096b41916f36f3032d1cfa8 SHA-256: 0ab9a68b131c77c9180a8cd64e00f1661dc58acc54ec5fdf870cafe0cfb0145a
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is 'https://gettraff.ru/strik?keyword=descargar+multimillonario+desatado+p', which is likely used to redirect users to further malicious sites or downloads. The document body, though heavily obfuscated, contains this URL, suggesting its purpose is to drive traffic to this malicious endpoint.

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://gettraff.ru/strik?keyword=descargar+multimillonario+desatado+p In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8700f4966cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f887610af535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f874dccab71e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8a1d9aa2991.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/gizixulu.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/65baefa75f437a6.pdfIn PDF document text
    • https://xoxuluxikodo.weebly.com/uploads/1/3/0/8/130814296/0d4c1c1c02d.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/runemevurexuziwone.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/1687824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f86f55811991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f8ab44294bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5f8c6ba207dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f88f86daa883.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/c4825c4c-3c37-456e-89d5-774d5803502e/jedamojutekavuverezusori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4de208-83fc-4798-b3fb-43697e02edef/lawojanifubarazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f1f6df-ec59-4d0b-9eb9-fb7c95a21bde/wijakapumatefuriretod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7715/2151/files/84940657978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9102/5827/files/22392432538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4440/1052/files/baredisam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8f2a44-2bdc-4e63-9fd4-370ca6f00f2f/79515460051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f12a486-6939-43a3-9525-a9dbe1071c6b/31900663785.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_off0000c276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC276 5392 bytes
SHA-256: 2f6894f81f41172d1318f6d520b8923cfcdc95057abadc09ab139a70fb480316
font_01_sfnt_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 11448 bytes
SHA-256: bd9bc702262cb24d780919416d3ed42b411719b32d81714faa1003ab52024df1