Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6811f4f241303e8…

MALICIOUS

PDF

69.5 KB Created: 2020-09-30 20:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 743924e4008add6bd1adcfd388b4f355 SHA-1: b716d9e984fe2f2d447558eabcf7265efa5f7e41 SHA-256: a6811f4f241303e8cde9b2d178e47af0b48a3fe6a5770c68eda8612d7d1af2db
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier also flagged the PDF as malicious. The presence of numerous external links suggests an attempt to lure users to malicious infrastructure, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 3

  • 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.
  • 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://ggtraff.ru/strik?keyword=alkaline+foods+pdf In PDF document text
    • http://detadag.racehunter.org/uploads/1/3/1/6/131607062/wobakikenelisogedite.pdfIn PDF document text
    • http://mebiteba.wavelengthassociation.com/uploads/1/3/1/6/131637921/jowijinefuvin_xomaranekap.pdfIn PDF document text
    • http://files.bhpcd.org/uploads/1/3/0/7/130739836/sujetifedunumij_nikenajike_folem_bawigab.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/b168a27f-335f-4b12-8ded-1b60ec61b29c/taxabijok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12be89bc-d6f3-497f-b360-52876818e189/fuvexakox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/895cc623-5177-43a3-a404-c79018ca8ff0/danagozew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552bc072-9a97-404b-b423-7ea2b176ab9b/vatelajokiditoruzudozonup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed12f94-ec96-4a93-a03c-6d1987509610/zukif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fd8316-1f96-45ec-85cb-cc6d5ec12d53/53858991116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e32a03-b62b-45e2-bd29-4cb535363418/73380676902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40363ec9-ed03-447b-99a6-d610e47a4e9c/20033734446.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 4992 bytes
SHA-256: f50900ac8a6a01fa2b85b2d63343a22c477d124611e96efdaf9da3f9f50641a9

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