Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff82a7ef827208be…

MALICIOUS

PDF

34.9 KB Created: 2020-10-30 20:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cfdcf0b1e5032740c32c2ec1387efbf9 SHA-1: 1e6ed90ed3e646a52f1b96342f3a0c274c84f226 SHA-256: ff82a7ef827208be8d555919696491b497ddf04bdb525c72c33c159afd37c251
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, disguised with text suggesting an album download. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or redirection strategy. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links within the document.

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.me/pify?keyword=antony+santo+descargar+album In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_5f9bdf916434d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f906ee18dfc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5f9539a4078ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5f98e20e2cef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8abdd256d26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f87424c4f4c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5f976db826260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f88874138c32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f9c4d04f1a84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/luwulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7421/5331/files/steel_pipe_fitting_dimensions.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_off00004735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4735 5492 bytes
SHA-256: 06f0d97b710df1e5f9d52852ac97e53f6c3f07703b806dfaa50c7f7f43b49b26
font_01_sfnt_off000059d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D3 10484 bytes
SHA-256: fe05ec41d065f167b99c141da29fd50b0ba77cf0e263e7c6d21a6c4e4b58b819

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