Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8fe917b783ab51…

MALICIOUS

PDF

59.0 KB Created: 2020-10-16 08:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 381e63cfc974a079163d66777672a5b2 SHA-1: 2c47cf69532cfa00d84fafe875c39e16c5867dce SHA-256: cd8fe917b783ab51b12b97e95e40bf7c6bdfc663d152e2d01ccd7371d394c5a4
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, and a critical link to a known malicious redirector. This indicates a link farm or SEO manipulation tactic designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ggtraff.ru/wb?keyword=como%20sacar%20el%20area%20y%20perimetro%20de%20lo In PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/3104eb2.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xizaxamuxive.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/fd1b3209b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f877ba3b0941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f890be2a3dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f8716cab7ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f886028c6943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f88bdaa0d97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f88cf8d155ee.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/ropis.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/dozowug-xuvuj.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3250b5961ed1.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/mezevoxinokimuwamibu.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/digefig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/22297813-1b11-4c7d-b39a-693e2f41974d/megefawafapenoxalatovatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3e32de-e198-477e-88cd-ec0764c4e7a2/3180914112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1554/3190/files/orbital_diagram_of_phosphorus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2886/3905/files/specific_heat_capacity_worksheet_gcse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5470/3004/files/limewire_android_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7698/6034/files/pso2_jet_boots_guide_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0710/3143/files/naf_atsugi_housing_instruction.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A2 5028 bytes
SHA-256: bbdb3bbb24af199d5d167c2c29148b95cc2ec934fba184b68fd05cd2316e3e39
font_01_sfnt_off000085c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C0 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00008e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4E 11184 bytes
SHA-256: 85c3b8d565baa36a81ec56a7a251f07aa1b71ce032c4500d480b2f84946c9558
font_03_sfnt_off0000b31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31A 17628 bytes
SHA-256: e32853a97a8b351c790306674e4ab0ea163eb57544f2c01dff8a823df4f6669d
font_04_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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