Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42d34d6cfdb0bac…

MALICIOUS

PDF

77.4 KB Created: 2020-12-29 18:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f301fa9f82e3645137d985e9b22a0442 SHA-1: 140b7c99c67f684874f1782508038d60f86ed3e7 SHA-256: d42d34d6cfdb0baceef965671719882fed8c77adac1d2910d2a426d98dd7ceaa
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'traffmen.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests a link farm or redirection strategy, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=cell+lab+evolution+sandbox+android
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/6c8aaa06.pdf
    • https://cdn-cms.f-static.net/uploads/4410717/normal_5faeb8dd55c3b.pdf
    • https://lofizalu.weebly.com/uploads/1/3/4/6/134601384/bidefake-nonegore-fuxiradala-gagujidakejode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3fd7a5f4-ad5c-4483-b69c-fedbbc4a89db/80452509123.pdf
    • https://uploads.strikinglycdn.com/files/def2a7a0-d37d-4f96-83bc-e2fd4fb46717/histology_epithelial_tissue_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/fce4f377-58ea-4042-badf-2c049cf03e14/buximataselumuwesogopekob.pdf
    • https://uploads.strikinglycdn.com/files/a906ba59-5af6-4856-a876-daf4d38a3f1f/bivalojaritoz.pdf
    • https://s3.amazonaws.com/kikunojulejuj/baltimore_ravens_injury_report_week_6.pdf
    • https://uploads.strikinglycdn.com/files/1d2f3224-a374-4c7d-b674-3781029528d1/88967031647.pdf
    • https://uploads.strikinglycdn.com/files/3ed751f3-f9dc-497f-867f-16ab5ca52730/amar_chitra_katha_stories.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef50.bin
7ea32d4fa389d15a11cee7873f5163c25400a74308775d2cba4235e409e6ee99
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 4992 bytes
font_01_sfnt_off00010050.bin
395234a48d570294a60d9bce5c729dfbb4098c496f90a49997991e81285c02cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 12268 bytes