Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc2ee16d1f02050…

MALICIOUS

PDF

44.7 KB Created: 2020-10-29 15:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2628b626b326e477a98f460352f4bda7 SHA-1: 965964006a10fee2301a68b80045935d205337a7 SHA-256: 6dc2ee16d1f02050b57a598ea133093efe33abde6a529e8b7d46e58af01d99da
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a critical risk, suggesting the document is designed to lead users to harmful sites. The presence of a large number of external PDF links also points towards a link farm or SEO manipulation tactic.

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.link/123?keyword=google+sites+free+banners In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f8e96fe61c84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5f97ad5689fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5f96e35fbdca3.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nidisetati.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/10c53f54e69b.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/sazariwapa/neural_networks_and_deep_learning_charu_c._aggarwal.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/hq_apk_update.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5626/6905/files/37586863129.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/cours_anglais_grammaire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9fa478-f2b8-449e-90d5-e4d77221fa57/81254216191.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/85529141391.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/vemetu.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_off000070f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F5 5104 bytes
SHA-256: bee01fe6a1ea3e3616ecd22b53bc6ed321089728ce11cff8df624034295f3062
font_01_sfnt_off0000826b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826B 10556 bytes
SHA-256: df209ac5baccdb2e2b972c26262922489ce521770259b4cccda807dacad46d9c

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