Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdb321eb363c163…

MALICIOUS

PDF

43.0 KB Created: 2020-10-25 09:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4a4b1c6ceb67668d051d2bee8aadbdb2 SHA-1: 1b520091f5ad70665b6581b57b53c48902572fcc SHA-256: bbdb321eb363c16324f51f2ba3fcef7e535e7c05b37b32569fa1caef6849362a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/123?keyword=rotation+worksheet+grade+7+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, suggesting an attempt to distribute or obscure malicious content. The ML classifier strongly flagged this PDF as malicious.

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://ttraff.ru/123?keyword=rotation+worksheet+grade+7+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f8ba3e16d460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5f91e7e3b1c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5f950485308d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5f8dd8fac6a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5f8f12e9e6ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5f913c9ae5e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5f90499c252d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f8c20b20aefb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f93f66354038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f8829cfd6875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f91466ea13b3.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/5317718.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/02b984e90a2de.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/9038680.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.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/d4b6d553-963e-46d4-b445-71e9ae35e30e/86511758427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99abb0e8-d1e4-4864-a1b7-d6fb70f3354e/jiduw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3edc7413-0cc9-4110-9c4d-a596fb4dd4ff/likasedubifufujitibaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4668e3a-d10f-4cfd-abd5-5ebd937e1f25/lovawolezineta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b31be7-fb91-44f2-8036-fafefaadcc4e/vewodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2f72dd-28ca-44c1-b317-eec8b0885eb1/libros_sobre_lenguaje_corporal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c95ff1-4818-4fb4-b101-fe27a1087d24/vofavolagefoxurisoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ddad70b-b0b3-4cc7-8eab-cc88a304a7b2/activador_para_office_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e5fae5-fd4a-487f-b11d-d1cb58d200a9/jewakulovasiloxox.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_off000068c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68C4 5512 bytes
SHA-256: 11bcce32d5d379016a8ff3ae41df75fae9c8a6c66764957da74dcd62015b7d02
font_01_sfnt_off00007ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA0 10244 bytes
SHA-256: cf003095d7cfad5de91175970b9a98d87c5c6a1274ed0d4020de0ef4ebf95469

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