Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb17b3ab6760696…

MALICIOUS

PDF

38.8 KB Created: 2020-11-02 06:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c712fe17627429ba2328330a322e145 SHA-1: b82e0a84575f6b2443cd33f51cc79ab87c50ffd4 SHA-256: 6eb17b3ab67606969f7381380ee22b8fb91ee4deae1f8ffe1e253845e011a8de
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or redirection scheme to distribute further malicious content.

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.cc/123?keyword=visual+argument+ideas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f8c0b6eca0a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f86fa88cca11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f986c0dd6711.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/c7b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f9801918fd47.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/418af759-7326-4fed-860c-3a66d9de90d3/zosazugijibuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7d30c9-d9f4-400f-abed-f4a2f54e1384/lun_dans_lautre_film_streaming_vf.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/jeevan_saral_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0beef0-3086-49d1-9803-c9c9e5b238ed/78055921025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5535a0-8f47-4bfc-80c9-243ca4aa1c85/budanugeretibiwoz.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_off00005aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA7 5108 bytes
SHA-256: d9cd07fcc3c20aa0814e3181ae6ca2b5b72fc178275faa8b9a935ee0a2b0f328
font_01_sfnt_off00006bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEC 10332 bytes
SHA-256: dd7e63855ee352a9c635cfabc1d965602374d15fe34201a52d70c88f1907e3eb