Malicious PDF — malware analysis report

Static analysis result for SHA-256 12601a5fcbdd7722…

MALICIOUS

PDF

40.4 KB Created: 2020-08-04 23:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f3e67bd4bdaeeb75af37594fee06756 SHA-1: 693c10605d04bbaf9085150925732692b74add6e SHA-256: 12601a5fcbdd77223adae072808f6decd1b2cdbef188c5528324cb7bf90e0215
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which are part of a link farm, suggesting a malicious intent to manipulate search engine results or distribute content through these links. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were directly extracted, the presence of numerous external links, including one pointing to a known malicious redirector, indicates a potential for further malicious activity. The ML classifier also 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/wb?keyword=chaos%20book%20james%20gleick%20pdf
    • http://files.onemanhealthsolutions.com/uploads/1/3/0/7/130739505/tenulilotoluzik.pdf
    • http://files.kiitrenewables.com/uploads/1/3/1/4/131453007/75fe59f77fe2651.pdf
    • http://files.reliableirrigationsystem.com/uploads/1/3/1/3/131380146/4452270.pdf
    • http://files.tkagritech.com/uploads/1/3/0/7/130740429/ziroriloxi-fatoji-bidijufejowazo.pdf
    • http://files.sydneywippman.com/uploads/1/3/1/4/131453902/6bff764.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/podixotesagajaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/zafokajukizexesevubebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/7114728120.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/43810763488.pdf
    • https://cdn.shopify.com/s/files/1/0440/6634/1029/files/biridadopojorazaguf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9233/7059/files/63219396398.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/90312559955.pdf
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/decision_problem_paper_clips_index2.pdf
    • https://cdn.shopify.com/s/files/1/0434/4558/4033/files/big_ip_edge_client.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/1140898961.pdf
    • https://cdn.shopify.com/s/files/1/0432/8754/3964/files/misasonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/nulidepizawinogaretidawiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/mebosoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/revepamofudaxu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f5d.bin
5bfcad10ac6ba94e4c23c1b86aeb21c80a584c127cfba634c07cd2a924aae960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5D 5660 bytes
font_01_sfnt_off00007277.bin
5f7643f46815c4e5ac1bd275f1bdc3d9172c33819fdf8047f307fcad3448631f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7277 9992 bytes

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