Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12f9232381af7a4…

MALICIOUS

PDF

140.4 KB Created: 2020-10-31 06:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd408bb217c7c0503175cb3eaea8a3fd SHA-1: 92a0aceb101d668241619a16af3f7d7b89ec16b8 SHA-256: a12f9232381af7a4e40a7dbdb6aa87c692d0009117aa1cf918cf1b7c1eba7f2c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identified it as a PDF SEO link farm, containing numerous external PDF links. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?keyword=cm+punk+age In PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/2748195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_5f985c63d757f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5f90681f79725.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/9369973dfc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f8b959f6132d.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/visafu.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/1/0429/6900/6236/files/zagamigiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2935/5432/files/rebufa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4116/3926/files/70655549997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0136/3619/files/26623290142.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_off0001ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBCD 4804 bytes
SHA-256: e56d76ca94dbc219951f8715e960bde2f54f8ac14635a7b019e35c6e5f811f0d
font_01_sfnt_off0001fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC1C 12736 bytes
SHA-256: 18dc051d1eb7699dff55d25568b74077eb93bc86954145c658f50bcafee5b812

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