Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d69f826e3b284d4…

MALICIOUS

PDF

53.1 KB Created: 2020-11-04 10:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 42a23c5d83776e87fe23de02b5fb9b2f SHA-1: 537b5d4fe5f6ba7a733bbe9686623e18fb0510f1 SHA-256: 4d69f826e3b284d4fe47c482fcd8e6a7ca63e295bd09d213af380a923c678f9d
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure. 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 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gettraff.ru/123?keyword=2019+new+proxy+sites In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f87a595dfa54.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/9112494.pdfIn PDF document text
    • https://sofowalomutupal.weebly.com/uploads/1/3/4/3/134310420/mepuwifisagukanum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5f9548b89d4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5f94bb75ac62c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5fa209c13ec1d.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/pewebopufupe/words_beginning_with_pin.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/konupaxidozuvabekoxavode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a2c234-c499-4c3c-a97b-47399a0f60d5/brother_sewing_machine_ce1100prw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/43733765496.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/93405356162.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_off00009099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9099 5220 bytes
SHA-256: 6cdae797db7ccc853fce9c65c5c7304ec720ffe4f51b93a8d6924b58bab41772
font_01_sfnt_off0000a28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA28E 10892 bytes
SHA-256: 7b2eb05d25a95ef385200e2162227d25ca59e10d39a006a319a30d57f164c025

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