Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e67585b1bab663e…

MALICIOUS

PDF

34.9 KB Created: 2020-10-26 10:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b5cee778b91505f75cbf3878ec5e27b1 SHA-1: dee002349f9f01360074ac1df9cfcbf056f78245 SHA-256: 6e67585b1bab663e8c1f2869f4604aa77888f84c3ebdfce80473482989c8bafc
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the heuristic, suggesting an attempt to direct users to malicious content. The ML classifier also strongly indicated maliciousness.

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 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.
  • 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=acoustic+absorbers+and+diffusers+thi In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8a939b8c4cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5f916365c0611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f954c1a1e403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f950e9208e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f88924f88686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411708/normal_5f952989b1ce8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/metewagegupasowaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4494/1223/files/nejenanifumesew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1802/6917/files/10658621839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a197a32-085f-44b8-a698-1dc2c3983e96/bomokebib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4b9cc7-795e-4d77-8531-0f4ead7c771a/aditya_hrudayam_by_spb_mp3_free_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bb97b6-dd6a-46e8-b45d-f2fa5e9a0d20/22942850711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0421b3f3-e3e0-405e-b24b-bffdbe96925e/98481934759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97331a8e-3c14-4e1c-af4a-6019af72dacf/telujuzisiwekozujagefimax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8c4aec-6ad4-4b1d-97dc-09015cbcd6d5/download_cq_100_hf_transceiver.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8608/4772/files/ribasipuwizanenirajijoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1367/0565/files/rolesville_elementary_school_pta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3509/3911/files/vivewasisijobibeje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/medidas_dela_cancha_de_basquetbol_nba.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_off00004f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F45 5208 bytes
SHA-256: f5d6f4d4a20c3c3196ccbcc92b9e0e143bbc6e1ad94b3ef5efd5afe0f7db5168
font_01_sfnt_off000060e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 8720 bytes
SHA-256: 389325b1a65f506e3fef0829eb805b5fc160a6eb6354152d94acfdb2322b3ed0

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