Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1725d4cbeb31c5…

MALICIOUS

PDF

83.9 KB Created: 2020-10-06 12:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 89a757c9bd1ab3d0318a2c076cedb7ca SHA-1: f8bea011ffe93c89a55be8834f581db506cd420f SHA-256: dc1725d4cbeb31c5b276f2b7f3563a9ab15adf31224bf0af9438f20351c9c9d2
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 'ggtraff.ru'. While the document body is heavily obfuscated, the presence of this malicious URL and the PDF_SEO_LINK_FARM heuristic suggest an attempt to lure users to malicious infrastructure. The file was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

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://ggtraff.ru/strik?keyword=repensando+el+futuro+pdf In PDF document text
    • http://files.individualizedfitness.com/uploads/1/3/0/9/130969300/2327730.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/1/0431/7737/7946/files/xiluxovapuzabidiviginum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6656/0163/files/linoxukoxafezapomopexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/99143925413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/cleaner_apk_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/kodaline_all_i_want_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/mukikoniroluda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/bunopiwuwib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254daade-c2ea-4f8a-8041-02cf616ed85c/18240260126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b89c6b-5dcf-4f78-bb44-221867878cc8/bozizotafuvale.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_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 5040 bytes
SHA-256: b330a0e54010461a0a605549e5163f9be81daa9fd86bbaa9e963dec8887e661a
font_01_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 11432 bytes
SHA-256: 4baaf5426d0314887a2b886ef156a90ecea25336ca2f8491c9e91f03d6c8b94e