Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b41a69acdcecc4a…

MALICIOUS

PDF

57.2 KB Created: 2020-10-11 10:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a4c24a543843d400596e668af8984d55 SHA-1: 91a712374f0950dfa9df2f4c9b40667d7dec2c86 SHA-256: 9b41a69acdcecc4a50e5e7b12df5f384f05562139a1b6244ef87dd614520cd98
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with heuristics indicating it functions as a link farm. One of the embedded URLs, 'https://cctraff.ru/pify?keyword=indicator+test+for+nucleic+acids', is flagged as a known malicious redirector. The ML classifier also 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=indicator+test+for+nucleic+acids In PDF document text
    • http://files.resources.norledgemaths.com/uploads/1/3/0/7/130738765/viwatimizitaz.pdfIn PDF document text
    • http://gavazadob.dxixprojects.com/uploads/1/3/1/1/131164573/lanodug-bawubojimomewe-vuwalufanugosol-vajutituvosu.pdfIn PDF document text
    • http://pagapo.15landsdowne.com/uploads/1/3/2/7/132740541/tujurezemupi.pdfIn PDF document text
    • https://site-1038691.mozfiles.com/files/1038691/61725450905.pdfIn PDF document text
    • https://site-1039217.mozfiles.com/files/1039217/wifeduzinakojujifimefefe.pdfIn PDF document text
    • https://site-1038565.mozfiles.com/files/1038565/zilesosazoreb.pdfIn PDF document text
    • https://site-1042446.mozfiles.com/files/1042446/81008409131.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/sesotuxog.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/280541b5-e8b7-4da6-98f1-6735e1385075/62118196546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6476b823-9b65-4a39-9459-8d7c82b3fb98/zudufekidit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afccffbc-d058-4631-9523-cc0709332791/gagubuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab09dcd6-bf77-4c27-a959-7613a79d3899/numutibuxunatenumokinat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1612c6e6-fa7a-480f-b7ca-1565a2071b75/56361704190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a669c9-8d20-4e1c-8b1c-bc09ff7626c0/fakiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c004e82f-4d78-429f-9074-9a9ba9c34672/jamewawamom.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_off0000a103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA103 4952 bytes
SHA-256: 1b1e9c1b284b5800537ea6a3a3a6ebca90067f13f621d18d06351bfd0e3b57bd
font_01_sfnt_off0000b1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 11344 bytes
SHA-256: a1e328b8710426c710ea7135b2abb1e93f11e43d99b357061fe52d0e9b572f60

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