Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c804a8d089127b4…

MALICIOUS

PDF

83.6 KB Created: 2020-10-31 06:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b862e8298f3de3cac4adf2f2f636cb SHA-1: fd08f2ce9761bf5c2475371bbc2e5591e7c497de SHA-256: 5c804a8d089127b4f8018d2c51468485d84ab6f7c1efa0599d4c7c5bff554966
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The ML_NYX_PDF_MALICIOUS classifier also strongly suggests malicious intent. The primary attack pattern involves directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 3

  • 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.
  • 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/aws?keyword=emergency+medicine+h%2526p+template
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/b2253e.pdf
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5f8d289ab5be7.pdf
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/wezegesosa-jigigazukazuro.pdf
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5f92c4a1b01fb.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/wevevafilawom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wenobagupexekap/monk_guide_ragnarok_mobile.pdf
    • https://s3.amazonaws.com/tadovu/postpartum_depression_test.pdf
    • https://s3.amazonaws.com/zetare/lipid_profile_test_in_hindi.pdf
    • https://cdn.shopify.com/s/files/1/0503/0386/0921/files/86604936245.pdf
    • https://cdn.shopify.com/s/files/1/0459/2241/8839/files/cassadaga_valley_central_school_board_minutes.pdf
    • https://uploads.strikinglycdn.com/files/567bbe23-3240-4d64-a513-28bf8961b517/93193474846.pdf
    • https://s3.amazonaws.com/kavalukato/newco_coffee_maker_filters.pdf
    • https://uploads.strikinglycdn.com/files/c7dcac28-e42c-4a3e-984b-ecc5604b7419/fivanujisakatax.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cbf.bin
342b3d0c3dd9db676cbb6e5b93df234c09cb8673da66b60b5b2df352c106cd6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 4992 bytes

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