Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb4f00874f1e584…

MALICIOUS

PDF

41.7 KB Created: 2020-11-03 08:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b8769f24290c3106f1ea86c10b746a28 SHA-1: 45fced65432742e860a2cbbbca37f7aee9eaba1f SHA-256: 6fb4f00874f1e584dd7162ca7481e82169fd827f11f2f558ed3ff1b2b40ea841
102 Risk Score

Malware Insights

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

The PDF contains an embedded link to a known malicious redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a harmful site.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?keyword=formula+for+equation+of+line In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f94c4fdcbee7.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/gogisunik.pdfIn PDF document text
    • https://winuvepesedop.weebly.com/uploads/1/3/4/4/134476249/bidoseraw-faxomumuned.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f99cae97a42c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f97e5828a6b5.pdfIn PDF document text
    • https://kotugupevexaxis.weebly.com/uploads/1/3/4/4/134493549/runepise-jezirudobowenuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_5f9be48f91fdf.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/gezami-xijerijaruka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5f96f2dcd881e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f89e9a2312c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f8fdb59c76b7.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/83e411a9-b04f-44e1-8ea8-3df638d6ecca/karen_voight_stretch_and_core_condit.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/81194616063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb93fe7-bcb3-47e4-9d38-5128fac37f59/p_series_convergence_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f620cced-49fb-4b07-8947-fa152fe1111a/67936319868.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/aashto_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f534b8f-6312-4301-a22d-6da6ee795a91/63262033279.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_off0000669a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669A 4816 bytes
SHA-256: 2d91060fbf65f29722d7faddabf2fde0a44f86c15f23da40edcda59f30444ef3
font_01_sfnt_off000076e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76E9 10328 bytes
SHA-256: fa124b03e0df4a5e5fcf613f5d088767d12bc187d7301094e6bf0206350e7fdd

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