Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbd7618c1b7e631…

MALICIOUS

PDF

44.8 KB Created: 2020-10-08 15:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b39915c95dd41ccea983715c7e4945c3 SHA-1: 71582fa2d626d4fc6119455d4e20cae99a611c75 SHA-256: 3fbd7618c1b7e63123efd0e7f71fe58beb44c8b36982058dd5d2f66241e9422d
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to workout routines and a URL that appears to be part of the redirection chain. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF links suggests a link farm or redirection tactic.

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=bulking+workout+routine+5+day+pdf In PDF document text
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdfIn PDF document text
    • http://xodod.steephill22.com/uploads/1/3/0/8/130874175/direredikogi.pdfIn PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/sutudumubuforizatifavofo.pdfIn PDF document text
    • https://site-1042888.mozfiles.com/files/1042888/fikibomovafopagafemivevis.pdfIn PDF document text
    • https://site-1043767.mozfiles.com/files/1043767/45661360176.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/1/0440/3950/4022/files/boss_hm-2_japan_vs_taiwan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/66849462872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1744/5793/files/91211866322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de494b4-d3bb-46a2-9bda-d9d3ef57c183/91607736945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e92e3cf-1754-4007-839b-fd6ad6cf5408/59481640507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d310eae6-2d5a-4ae6-a6b3-bc58b3631e0b/wodizofukeme.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_off00007125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 5460 bytes
SHA-256: eba02b971f7fecc92b9a9b0c2db67bf3b800c647382c60257bf45d94625a0a4f
font_01_sfnt_off000083ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83EC 10024 bytes
SHA-256: f9c5d3daed5441f548e95b36d9eb0b330e8da55a1193d6a316b6bb7f9ee7c322

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