Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c0aa399cdcdc7e…

MALICIOUS

PDF

47.9 KB Created: 2020-10-26 02:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fb86cb70af145a99f105ddbedfa70c8d SHA-1: 955f78744bf4fd3ce47b61c02e3a22305208ac45 SHA-256: 77c0aa399cdcdc7e16222431ea531fa5e06a3f753bbc8fb92a402e0449f952b1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to external websites, many of which are hosted on disposable domains and are associated with redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links. This suggests the PDF is designed to redirect users to malicious sites, likely for SEO spam or phishing campaigns.

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/strik?keyword=command+line+pdf+merger In PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/2500da0430cb.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/8547873d93593.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/vobagomavuvazi.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/2228231.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/7452e4a6a.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/2696566.pdfIn PDF document text
    • https://lisevududotuwak.weebly.com/uploads/1/3/4/2/134265384/zesogesif.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/6501154.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/feee9600c1464f7.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/f99449e32f852c8.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/99cbd211-9da3-49ec-927d-615b95fb2e3c/92988175123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ae984e-e5ed-44bc-baa6-0366553294d3/40472361754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4a91f1-02f3-487a-89f7-2625fe3321dd/34402279232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976914c4-7740-4a5c-8a35-e9386fb3195d/nuvuxoleji.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/the_tattooist_of_auschwitz_book.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/lista_de_atividades_mei_2019_em.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/fawadusikam.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/64982223991.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/jupasatuzofugibiriwetije.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/aconex_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/91731567552.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5D 4912 bytes
SHA-256: 23e08acbeae674ae104406bdf90a33b639885a1fcb4741faafc37607827df8d1
font_01_sfnt_off00007cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEC 11388 bytes
SHA-256: ffe412257b38bff2823e21a7700e1d25aaecd7d2064408c83c6570402d706c12
font_02_sfnt_off0000a3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34