Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d59b92edf532b0…

MALICIOUS

PDF

39.0 KB Created: 2020-11-01 18:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4cedc4dd116bf3b1ac200dd59f9cd925 SHA-1: d2c346e223ef9f2a533f1b5da18948c65bf787d0 SHA-256: 79d59b92edf532b03c36618956a271a832c40e456ca930aa6008ab26be031b02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=uvalde+high+school+mascot+images In PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/ganifa-zabipo-gukamudew-nuvakevomoraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5f8c6ba2da1f3.pdfIn PDF document text
    • https://sagoxanoku.weebly.com/uploads/1/3/4/3/134350044/wurowuzi_pezod_minogavuj.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/1ff17d42-768b-40aa-9b9a-e5cc9060ee57/6447199135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517ef6f0-8f89-4f3e-861d-379222d36dc6/nalogotamemibewurevan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a13c99-f130-4902-b249-9627ee58c4ea/buzof.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/sojijenewubuwapesivupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e6e10a-8702-4f2e-9aa7-30b22d1c89c4/86551900310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e184bc-a4e8-49df-8c96-9a4bab924578/24498856483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4564/2663/files/68465022234.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_off00005690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5690 5308 bytes
SHA-256: ac12e817d432b031faf349c029fee63fa923b79f0d0d813d41156d8f93707766
font_01_sfnt_off00006882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6882 11840 bytes
SHA-256: ce7089afcf7e9a015e5ec318f754b4f0f737b89577ad03054257a1da4f12ad29