Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5d2493c476f5ff…

MALICIOUS

PDF

39.7 KB Created: 2020-11-02 19:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bf3a97bc2794af85728062c24680f8d9 SHA-1: 1e4cab5a487fe706e3b2ad7bedd09e80aa495c82 SHA-256: ed5d2493c476f5ff0bb391f7629eda2c6763428fa7036dadd76aba8720c0f178
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=newberry+academy+school In 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/cee14383-7b39-4395-9e1a-ee7b601171bb/40841530027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3183/2987/files/sierra_vista_movie_theater_clovis_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ba6432-b7c6-49a6-8a3b-4f4780f63738/kumufilobasuvenixi.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/90877237552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5479/1328/files/scramble_words_worksheets_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3162/5882/files/the_girl_who_fell_from_the_sky_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4444972c-d228-4b18-8e7e-08bb51fb87c0/zotiseruzoderaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d857b78-3efc-4816-a69b-f0dd07e7910a/89257367953.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/chicago_cubs_tv_schedule_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/english_short_stories_with_moral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3970/2171/files/wazijelaxapav.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_off000058ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58CA 5480 bytes
SHA-256: f4cd54fd3c53b42b960a6f0b0144f904c7543b91b93d88ee26e485076e480bf5
font_01_sfnt_off00006b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 11532 bytes
SHA-256: 94007a14bc1f1298ee6bb8b7d791ff61e4534db7b380b91cad4a9d30ab54d40a

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