Malicious PDF — malware analysis report

Static analysis result for SHA-256 0914350f837ba615…

MALICIOUS

PDF

48.0 KB Created: 2020-10-25 08:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 90643ff5d9bbb9ef9458f649514afebf SHA-1: 5d68dfdc5f014ec7379c12865edbfa9e6b81b8ad SHA-256: 0914350f837ba61559bba64c3d5dd8cef9b81b9ce99b5778aa06fdc297cdba35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains references to medical terms and the tool used to generate the PDF, suggesting a deceptive lure.

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 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.
  • 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://ttraff.link/aws?keyword=encephalopathy+hepaticum+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f890626eee41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f924adf53fe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f8cf05ebfe00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f871bd770fcf.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/9905289.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/5292646.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f875faa5e23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f8953ff67016.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/1/0491/6962/9350/files/historia_original_de_la_bella_durmiente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e23777a-cd53-412f-99cd-7208ec68f276/xitokesebot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936d310a-669a-46b9-ba0b-980d2a1edf79/81640063303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc72a80-0bdb-4ecb-a6c9-39f7a8858e99/72847710533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092c4038-1256-4fb5-9862-c0285b2e7c87/40157303831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b125f3b1-8676-42c1-b3d8-52338591f23b/jovozojuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d4588b-b904-499d-a962-78a4059ca9e2/zebarisulubepifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50d27d5-a38f-4a47-ad30-535133d4184d/ensayos_sobre_la_problematica_curricular_de_angel_diaz_barriga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458069a9-c2b2-4bdd-9513-f12ee7cab2f0/29369664389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7396897b-5887-4ed8-bada-9b36791dce78/napofekuginejibudubux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3b0851-9486-491b-ae63-3aeb1f4e74e0/86317874714.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_off00007e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E11 5180 bytes
SHA-256: 642fa608a44bd6cf73f73ad16c951fcac907961776ebf30edac9b73842b2eb10
font_01_sfnt_off00008fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA1 10328 bytes
SHA-256: 259ad0b232dd63973e9dc11439d345c1df65bef0e2f014d89662ade717b45110

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