Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6f8212ad56185b…

MALICIOUS

PDF

42.1 KB Created: 2020-10-06 09:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8927b6fa25ce48f949ca6f4b67f0c2d7 SHA-1: 333e7237e71c649e2b2dff68dfa10a03c635b38e SHA-256: 8f6f8212ad56185b8ea98671ac391ff46d765caaa0b253c8016ef6a55703c87f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though partially corrupted, includes the target URL and suggests a lure related to PDF manipulation. The ML classifier strongly indicated maliciousness, and the presence of multiple external links, some to unknown domains, supports a phishing or redirection attempt.

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://ggtraff.ru/strik?keyword=how+to+create+highlight+existing+fields+in+pdf In PDF document text
    • http://lugudo.4d-products.com/uploads/1/3/0/7/130776177/76c071359.pdfIn PDF document text
    • http://files.allstudentsallstandards.org/uploads/1/3/1/4/131437599/robirusutifugitudid.pdfIn PDF document text
    • http://files.rcdesignceramics.com/uploads/1/3/1/1/131163660/1520026.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/0faa28f4-1f9a-4394-90dc-7bc3298736bf/80425030839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11196089-76b4-4263-8ead-7b723886ba2a/kakepilagogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0864dbc8-2d32-447d-8586-3e1be3cac403/41390652536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a530ec-99c3-46d9-aef5-374cc876691d/vatijuzabiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291fffcd-9881-4fe7-9ddb-bea22cde7c08/37999733306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/620df915-7b2e-45c9-aec6-5f824e6f353b/27790615387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f5af02-d360-4a21-922a-783eae77c835/66867630810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb4ff8b-99a7-432f-b06a-a56ede07b4c3/wekuxifolesat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1e8072-9235-4562-99c2-40aea9ba7ed1/79990996947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8987fc-0482-4ce0-a1ba-f2ef9dbd08dd/48285336239.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_off00005dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC8 5540 bytes
SHA-256: 4a27e06451bc86f00de41fe74d60d6188e968bb0c62fcb7073aa36d78630e403
font_01_sfnt_off000070b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B0 13640 bytes
SHA-256: 41eafddf10b183b008f286ee9ac7d9f1f2f3109fb136712494278faa3e3e16cd

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