Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6160af76ab13dfc…

MALICIOUS

PDF

41.0 KB Created: 2020-10-07 11:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0059cba77b1e7afb1572dc18dc10af56 SHA-1: 5ae5f6eb4552758de44e789aacb89f98e213ca79 SHA-256: c6160af76ab13dfc3d181e4f103bdf3c486263025692d91f220090b817d8c820
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=ibm+aix+java8. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users to external sites, potentially for further exploitation or phishing.

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://cctraff.ru/strik?keyword=ibm+aix+java8 In PDF document text
    • http://goximed.ridgefieldgardenclub.com/uploads/1/3/1/6/131637649/fatevomege.pdfIn PDF document text
    • http://files.naschuttdesign.com/uploads/1/3/2/3/132302859/zomelonovut.pdfIn PDF document text
    • http://files.shop-phe.com/uploads/1/3/0/7/130738637/riwadaj_moduziv_tojubibuk.pdfIn PDF document text
    • http://files.designsbyjmartin.com/uploads/1/3/1/6/131637108/siros.pdfIn PDF document text
    • http://pepek.mhrspl.com/uploads/1/3/1/1/131164250/3dbf7d88f1c.pdfIn PDF document text
    • http://tomozopa.biblebeltfeminist.com/uploads/1/3/1/3/131398020/c49df06.pdfIn PDF document text
    • http://files.forestfreshproducts.com/uploads/1/3/1/3/131381374/jebulerawakizos.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/d85250c4-5846-40f7-9c4c-b113cf00d31a/beropazolekobib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a442f3-e391-49b4-96bc-0989df13dee2/piwelewagubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd13da43-2c90-4271-880d-7b8a897c4b80/87924103441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74bb9a7f-4ef0-4325-aa86-40e5595f26b1/fivupidenijedagowujinefas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e40f7b-29c6-4d3e-aef2-c40a5630e539/86873364955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd7ff74-16b8-4037-8a36-ade8270d52ea/28844966347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c4bbd7-2819-4ffb-88a9-687d3a90d164/62727854920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b685dbb-4439-4994-ab0b-9b6ac1ed9198/godudupemasajamoxujasejas.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_off00006290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6290 5000 bytes
SHA-256: fdf61775107c9cbbb7a298510158339b07b6bfbcecf61f5df7987fb9be9ec428
font_01_sfnt_off0000738f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738F 10564 bytes
SHA-256: 8798d5d7a3a50fa031ca48cdfca7e0fea9154ce03975a6e1553f9fb2a38da7a8

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