Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca11a763990f83c…

MALICIOUS

PDF

39.8 KB Created: 2020-10-29 20:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f7ce7b054b7911c0833cb91d11358a99 SHA-1: 9e5733a104d9f3feb97a94a8efcb5e5bbb9702f2 SHA-256: 2ca11a763990f83ce18b2dbe9b5288112fac2a441d83ac6207043c082d7985e1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate a deliberate attempt to create a link farm, likely for SEO poisoning or to lure users to malicious sites. While no scripts were extracted, the presence of embedded URLs and the ML classifier's strong positive signal suggest a malicious intent to redirect users to potentially harmful 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://ggtraff.ru/strik?keyword=the+knight%2527s+tale+summary+shmoop In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f912623114af.pdfIn PDF document text
    • https://wojowoseda.weebly.com/uploads/1/3/4/2/134266381/3bc9b2c726c.pdfIn PDF document text
    • https://vabejodero.weebly.com/uploads/1/3/4/3/134378136/vutidag-semulenijesivus-tuwiwaforowa.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/memul/15202242717.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/bapunukafeko.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/borsa_istanbul_nedir.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/clasificacion_de_atresia_duodenal.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/gigeluzabofapupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/brita_water_filter_bottle_instructions.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_off00005d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08 5380 bytes
SHA-256: 8049ee23f12cc1ca411a737851baa8af62f7aa0f7ff8dc8a4ad8342b801ece1a
font_01_sfnt_off00006f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F40 10476 bytes
SHA-256: f8998ea3387560e0f5c0cff85dbe3918aa3c6e3cbc19842db41dcb7be6dd775b

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