Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ed4eefe8388c33…

MALICIOUS

PDF

43.6 KB Created: 2020-10-20 06:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 96369e4e65a44dbde2a1f7bcca97c45e SHA-1: 869a9321e098c28a484b603f80cc71ebc14aac5d SHA-256: 73ed4eefe8388c33e343fccb7a2d03f5dd8969f3d30f5d987dd3b1931fa88222
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggraff.ru, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, appears to contain the URL, suggesting a lure to trick users into clicking it. The presence of a 'download button' heuristic further supports the idea that the document is designed to prompt user interaction with malicious links.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=swimming+merit+badge+workbook+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f87bfd57779a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f8a636fd848b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f8b11d69990d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f8b9de12d243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f89eaa61a211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5f8bf25793415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f88a2199e172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5f8d893b5e50b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9652/9819/files/fujir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0239/5331/files/wafip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7309/2766/files/two_way_frequency_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01c634b-0386-4266-ac9c-d52604d52f5d/gimejuvodedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7987/4213/files/lajixusife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5854/4292/files/ffxiv_fashion_report_this_week_133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8841/7446/files/42212902992.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1977/8720/files/5144252754.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8997/2385/files/xanoruwogujo.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_off000069da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69DA 5552 bytes
SHA-256: 445da6b4ed115197a4daf815484b0d11695564718b8554b9fe61a5bc4e9fb942
font_01_sfnt_off00007caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAF 10704 bytes
SHA-256: 71860a0130731972f1058bcc8c9190a52ac6ce7048f1d9afa9df5840d90495d7

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