Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a537cd8fa22ba8d…

MALICIOUS

PDF

37.8 KB Created: 2020-10-25 15:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: c2d0616bd4c591b990d59da878556c14 SHA-1: c51a1bdd6174131c7975e167d86f54b325fe78ee SHA-256: 9a537cd8fa22ba8dc9f15deb090aace846bd243dd0f3400d23b42559adcfd02a
184 Risk Score

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=differential+and+integral+calculus+textbook+pdf In PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/13433fe.pdfIn PDF document text
    • https://wubabenababi.weebly.com/uploads/1/3/4/4/134432193/wufuwi_vobojajo_sezuwijuwadabet.pdfIn PDF document text
    • https://kuzewejutoba.weebly.com/uploads/1/3/4/3/134398832/a141265.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/lelorozexo.pdfIn PDF document text
    • https://fudixiboronis.weebly.com/uploads/1/3/4/3/134322082/2920119.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/e05e60.pdfIn PDF document text
    • https://napuraviseso.weebly.com/uploads/1/3/4/3/134322211/xeponekewaga.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/nulawonifepakinoj.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/vunojeluzo_nuwobam.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/8827080.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/nukaxiweroteme_zotujaxotejadu_rekajaka.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/meleru.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/vubegirudatetigujevu.pdfIn PDF document text
    • https://gijakumode.weebly.com/uploads/1/3/4/3/134306186/63a67.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005170.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005170.bin)
    • https://uploads.strikinglycdn.com/files/e06f0112-c5ad-46e6-a07e-7ae24e8b5bb3/kebirosixabudojitugesaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055f0a3d-6ebc-4c3f-b94b-19a7f430a13d/53352547644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ea0a96-6a77-453e-9407-c974a0c1329a/37680979508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a01f37-615f-4875-b259-73e21f5a3bff/81464197870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7090a2d6-65e1-49bd-b6f2-942d5456b2cd/42583260375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb40ab8-3f9f-42e3-b34f-3bfb92ccfa5c/35326527908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59088ae1-90f3-4921-913c-3d29f4dcb42f/9674531422.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 extracted file (font_00_sfnt_off00005170.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5170 5596 bytes
SHA-256: 4737aa12e5d3367e1fb1eb68bdbe99f573e5d73dbbf64a666a22b5aacd916d85
font_01_sfnt_off00006486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6486 10484 bytes
SHA-256: 714f1922184977ee7ca1b9c188b2ff7480169d09d40557b96bd00590e7d04b99