Malicious PDF — malware analysis report

Static analysis result for SHA-256 80083363d10c5443…

MALICIOUS

PDF

37.4 KB Created: 2020-08-22 02:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14f9b1d50f05951902b9834823624c18 SHA-1: 14e9d159f4c847b81954cefc79d786ef2b13c936 SHA-256: 80083363d10c5443d60bd9b602ad2590a5d549b009c60a63c2578351838c8398
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content through these links.

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=poc+long+form
    • http://kimapaxup.bbt-livonia.com/uploads/1/3/2/3/132303354/18d0dca34.pdf
    • http://files.annawatkinsfisher.com/uploads/1/3/0/7/130739951/6803078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9467/8435/files/mogotasav.pdf
    • https://cdn.shopify.com/s/files/1/0462/6654/8373/files/losibinunevado.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0301/files/39656227370.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/6675388928.pdf
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/fosidudasepezirisobe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/formule_du_bicarbonate_de_sodium.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/xatorexam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/oxford_bookworms_library_audio.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_off0000568c.bin
5f4bb6c3db5c5f8c4101195915d16b6ed231257313fbd339be1be089ad1ba4f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568C 4816 bytes
font_01_sfnt_off000066d3.bin
6b31b6bce1a42441f4fdda76612129e26a1ceceb86d708085eca15ea175ef1fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D3 10312 bytes

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