Malicious PDF — malware analysis report

Static analysis result for SHA-256 573a1ac2f705332c…

MALICIOUS

PDF

33.2 KB Created: 2020-10-10 17:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8d0e2d9486e33593a4f91d37433e71a9 SHA-1: 8fd147b4502d320e8884e592328c39c1dde4673c SHA-256: 573a1ac2f705332c4a285f09ab0de67d1d1c16a84c8eb011e43ab12daf45698f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body itself is largely obfuscated but contains references to the redirector URL and other PDF files, suggesting a link farm designed to lead users to potentially harmful sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=ninja+cat+game+bbc In PDF document text
    • http://files.hoarder911.com/uploads/1/3/1/8/131856476/pebitozowofulu.pdfIn PDF document text
    • http://puwabu.arizonalocksmith.net/uploads/1/3/1/8/131856643/9834739.pdfIn PDF document text
    • http://rifib.mealprepdaily.com/uploads/1/3/2/7/132710797/7712e63.pdfIn PDF document text
    • http://files.hugobittar.com/uploads/1/3/1/3/131398279/wixekonejulujimo.pdfIn PDF document text
    • http://wugalef.rjmpc.com/uploads/1/3/1/4/131408899/2592455.pdfIn PDF document text
    • http://files.itspopo.com/uploads/1/3/2/6/132681812/wuwajiwiges.pdfIn PDF document text
    • http://rumew.rosedaleshakespeare.com/uploads/1/3/1/8/131857782/3489860.pdfIn PDF document text
    • http://files.eclectic-shamanism.com/uploads/1/3/1/4/131407629/07363c.pdfIn PDF document text
    • https://site-1039578.mozfiles.com/files/1039578/gajazuritadujon.pdfIn PDF document text
    • https://site-1037916.mozfiles.com/files/1037916/80980979165.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/7e8337d5-271f-4e2d-b04e-5e6122d74fe0/taruzaxaxujofiviluvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b04d0d-1d34-4a76-8714-80a47f7f7a22/4916464541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350bf74f-ef99-420e-a738-7483874a39d6/29368313908.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_off00004645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4645 5000 bytes
SHA-256: 8c2e79478e9374df7ef48a0ea23fe1cf7ef762666002ef494895f39de86fd405
font_01_sfnt_off0000573a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x573A 9784 bytes
SHA-256: 7bec2388538836417b19b3889aaaa2f153f11040d51c40f382b191b896d58ce3

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