Malicious PDF — malware analysis report

Static analysis result for SHA-256 1152144b0ec25ac2…

MALICIOUS

PDF

42.6 KB Created: 2020-08-13 23:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 968a57882f9a350bcf738c6ba4242076 SHA-1: e804c9409e6c467cd85577719b9e44c779d32ccb SHA-256: 1152144b0ec25ac224cdf130a0f7c44c00067935a89d122f578697a6c75eb937
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, likely for SEO manipulation or to distribute malicious content. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to harmful sites.

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/pify?keyword=android+auto+ford+sync+3+problems
    • http://files.thesustainablog.com/uploads/1/3/0/7/130740097/a5a3ab4b3c3d0.pdf
    • http://nibadebi.hc4yf.org/uploads/1/3/0/7/130738524/kibibegufujana-zotanufe.pdf
    • http://buboxar.stanthonysparkfalls.com/uploads/1/3/1/8/131871721/8689672.pdf
    • http://files.betruebydesign.com/uploads/1/3/1/4/131453076/4999398.pdf
    • http://files.allthatglitterscompany.com/uploads/1/3/0/7/130739789/634e7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/download_videos_from_any_website.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0439/9503/7854/files/boxevenasan.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/array_and_pointer_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/labutijebijenabofabova.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1336/files/6236909362.pdf
    • https://cdn.shopify.com/s/files/1/0436/1607/5939/files/kutabid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/43735684262.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/wobul.pdf
    • https://cdn.shopify.com/s/files/1/0433/2974/9145/files/29972703174.pdf
    • https://cdn.shopify.com/s/files/1/0429/4053/0854/files/859977484.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/keyboard_books_for_beginners.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_off000066e4.bin
11e46a3d7c40d7fb29664458f35cb8a560a7327c18cfffde86c0f846d887f8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E4 5696 bytes
font_01_sfnt_off00007a2c.bin
4ac98cf05fb197b4fc5dd355ef044ed0af195f10b4ca6080f7bb1bf3c1dae4e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2C 10304 bytes

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