Malicious PDF — malware analysis report

Static analysis result for SHA-256 876f85032001098f…

MALICIOUS

PDF

52.3 KB Created: 2020-10-13 21:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 79d21cfc2458919090778bc219583cdb SHA-1: 5c6c45652672049b065e45cd333817366dccf29f SHA-256: 876f85032001098f7b5376aa25b07cfba1ab8a20fac65406749895a7afcf632d
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to 'manualidades creativas para niños de primaria' and the malicious URL, suggesting a lure for unsuspecting users. The presence of numerous links hosted on disposable domains further indicates a link farm strategy to distribute malicious content.

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://cctraff.ru/strik?keyword=manualidades+creativas+para+ni%25C3%25B1os+de+primaria In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/837046.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3029889.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/987b21c6b.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • https://site-1039324.mozfiles.com/files/1039324/sixupuradulosafubales.pdfIn PDF document text
    • https://site-1039633.mozfiles.com/files/1039633/gasefupefe.pdfIn PDF document text
    • https://site-1036691.mozfiles.com/files/1036691/futebozeson.pdfIn PDF document text
    • https://site-1039992.mozfiles.com/files/1039992/9126802003.pdfIn PDF document text
    • https://site-1042937.mozfiles.com/files/1042937/watovisutasonitafut.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/1/0431/5791/3762/files/agario_unblocked_666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a47e64-4fc2-4bd6-bda2-5cf28c86f3f8/vajenatarojovobufenireji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c2cd10-74ba-426f-9f9f-97b6ab717dd9/77523635992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7805e9f4-f2c9-4a64-8610-3696458bf67e/57465192402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6537c8d-adc6-4ae0-a680-527d9ece6986/vinabafupuvofene.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_off00008956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8956 5496 bytes
SHA-256: 80da99eca684a7217eeef72328bd2dcbed883ea4c486a0a02bffa6cd54bd82f2
font_01_sfnt_off00009bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB4 11604 bytes
SHA-256: f80ebbb5a6ccce9144e1cbdfb4f49900ac3aa3909f281a3e358ef6164ac1a6b2

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