Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efd47a0e7b20960…

MALICIOUS

PDF

43.1 KB Created: 2020-11-06 21:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 35d7a8bd4282c12db520308b07341924 SHA-1: d91cdd82c84bfd9c7a8a68c899318954a0abc901 SHA-256: 0efd47a0e7b209607d69ca9140c9e3b09567baea8d0badf197b41460f86255bf
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://cctraff.ru/aws?keyword=uniqua+backyardigans+quotes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f978041b467c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5f95e4bde2ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f91433137fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5f8fa8d609a1f.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/972e5561-ed82-4be9-a359-73c586e6ea08/wekimaresuxozafuwofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143f6792-3021-4c60-9b83-7f145a6ed8a5/vomube.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/define_capital_punishment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6489dc1e-437f-4f38-af9e-e8d0dc51ced9/70284015390.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/38880562762.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/11252723784.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/words_that_begin_with_hard.pdfIn PDF document text
    • https://merogiwa.files.wordpress.com/2020/11/pexoxipib.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_off00006769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6769 5500 bytes
SHA-256: 0784c2d242d207f47738d43b3255cbe33fae00fd7ea26b2739b81684606e5fee
font_01_sfnt_off00007a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2D 11152 bytes
SHA-256: 97afc99ec68669c4535596c7678f1895ca15a14b96825f58c40bb23117ab297b

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