Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f5beb105dd6b2c…

MALICIOUS

PDF

43.1 KB Created: 2020-10-24 18:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 350ca0a657bbb3092e5adecc7342e493 SHA-1: 16552804919493c80faa051e6d328d585f4d9de2 SHA-256: c4f5beb105dd6b2cad9d34b2ac55bde30e97c2488e6cc9c9c2661ba43a566d2c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of links and the use of redirectors suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

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/aws?keyword=ccir+601+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f889ce2994b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f8b507be3b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f8a6c018e94b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8af845f26fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8c1ba7d65d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f899b3314275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_5f937f53ef33e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f87d3b2eb221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5f914cf86ce8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f8fa50b5d211.pdfIn PDF document text
    • https://zodujojon.weebly.com/uploads/1/3/4/3/134321756/4319744.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/noleme.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/1914336.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/dulukijijevos_dunuziledibew.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/5116.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/1099919.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/865368d66db3.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/962751ed-6e91-484c-b1b7-2d4fc7d99060/cheat_engine_mount_and_blade_warband.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7b5d35-e552-4bcd-8e00-4d2065c0f54b/59978790712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c5826b-41eb-4738-a6a4-1659ba6b77ed/13554595991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5419e5-8002-483b-9214-86c2015fb14b/steam_turbine_efficiency_calculation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250e75fc-40b6-45a6-a372-fa8da8acd6bd/bizexexe.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/dunokejojezodanuluwa.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/armando_hoyos_diccionario.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/58724072250.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_off00006723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6723 4980 bytes
SHA-256: 56625b44d20b4f523a04032e648e7e4167d072deebea48f7a73372aab72c221b
font_01_sfnt_off0000782e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782E 11656 bytes
SHA-256: 7245e7708f3bb4864ea9b0704ad8bd4ae92204b78b31f7a157afbb70a9a53d52

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