Malicious PDF — malware analysis report

Static analysis result for SHA-256 1edf990cf12cbd55…

MALICIOUS

PDF

66.7 KB Created: 2020-12-08 22:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 542e6408dba8a7e42480682dc48e2023 SHA-1: 2ea2dd4cf12180aa8c944fe7b102b1084b09ec79 SHA-256: 1edf990cf12cbd559a4dff0977db1c57b987a4d8d33975676d092493380f97dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine rankings or distribute malicious content. One URL, 'https://traffine.ru/wb?keyword=baaghi%202%20songs%20video', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/wb?keyword=baaghi%202%20songs%20video In PDF document text
    • https://gilolubirej.weebly.com/uploads/1/3/4/3/134309297/tenikisar_tapubi_lazapepe_tafalibefekusep.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/1518381.pdfIn PDF document text
    • https://lotuliwupufak.weebly.com/uploads/1/3/4/8/134873452/594134.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/sanewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5fa37c1b23de9.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/lugamogexas_tegit_donupefuwisozef.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/wozitawaxu-buvir-mewux.pdfIn PDF document text
    • https://musejeruz.weebly.com/uploads/1/3/4/7/134740211/a375a9373.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.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/15abebf1-9e29-4dc2-8cad-b5c962a0fbad/uzlatrma_st_yaz_rnei.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/8106036843.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/trigeminal_nerve_anatomy.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_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 5200 bytes
SHA-256: f83a3da1ef0c1d8ad904ed5e3c7a07912f3cb8dcf7c16c8302d24e5a33f35a98
font_01_sfnt_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 11584 bytes
SHA-256: 8d47a352a578d98c7ed5cb2496e268d5ae2766f2eff0b6147544add1a5c5bede

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