Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78142139e63197a…

MALICIOUS

PDF

36.2 KB Created: 2020-10-10 10:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 523b010d85cf27db6276cb242107f3aa SHA-1: 691404248f674ff86f538da3ada69f7fcc826207 SHA-256: c78142139e63197ac563b3bffab168d99a3e4d3546d4be63f563888c2cc251b9
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm hosted on disposable domains, suggesting 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 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://ttraff.club/pify?keyword=cub+cadet+42+zero+turn+manual In PDF document text
    • https://site-1043923.mozfiles.com/files/1043923/37124978185.pdfIn PDF document text
    • https://site-1039618.mozfiles.com/files/1039618/zibopatilidexike.pdfIn PDF document text
    • https://site-1041413.mozfiles.com/files/1041413/xamaberifedabo.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/fuxuga.pdfIn PDF document text
    • https://site-1036689.mozfiles.com/files/1036689/degirevorukamonefawujovag.pdfIn PDF document text
    • http://files.uauto.solutions/uploads/1/3/1/3/131384113/gipememu.pdfIn PDF document text
    • http://fizep.cfkayakrace.com/uploads/1/3/2/6/132682790/pukekixi_fipajo.pdfIn PDF document text
    • http://wegadix.roastinghousemcgregor.com/uploads/1/3/1/3/131380284/pajev-kawuruw-buwob-vigefofeka.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/04525130-d476-4ac6-88fa-fcd32abd8d30/61769094891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7aa957-42d4-405b-8bd6-0b9ee7ac69fe/77258840406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef23decc-2dc7-470b-90fe-009695958396/pawelanadof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393b34ec-d1ab-4e63-b13f-913501bdc324/zujisenoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219938b6-315f-434c-8c91-c2b58c569586/besogazujavuzexakebuxor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d856af-3465-4063-996d-6b438f70cf32/robizizomuboxaginabolunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2c4113-6c57-404e-8496-e9075ef77aa1/darukarapadivowaz.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_off00004fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCD 5220 bytes
SHA-256: b5a4847935b682aff597b527a4d8120e9c02c4b2c20ee4f7ba941712a4577c68
font_01_sfnt_off00006180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6180 10060 bytes
SHA-256: 4b444c6bb5ede553d28561c16c0eb0e414e4be2a2203e0ac81e8a8c444b26a94

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