Malicious PDF — malware analysis report

Static analysis result for SHA-256 7287b8465f67d7bd…

MALICIOUS

PDF

44.4 KB Created: 2020-08-23 19:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7956c2c5d74e5d3ed8c45c07d07f238 SHA-1: 65cb504efeab6998d92ebdafd04ed8fcce8749a8 SHA-256: 7287b8465f67d7bd56d0d14a57d636a14eaf55dfac941b0b19d0cbe9e51a558f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various destinations. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content or phishing 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=8+ball+pool+game++for+android
    • http://files.ambermediasolutions.com/uploads/1/3/1/4/131406592/tasararozovogore.pdf
    • http://files.claireawarden.com/uploads/1/3/0/8/130814475/9299608.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/best_book_for_history_of_english_literature.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/22738088515.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/tintin_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/gejaragegupunirikilemav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72163988246.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/xokido.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/86081786169.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/mebilipetaloxaw.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_off00006f6c.bin
ef5726a711a8286f5f0496085411506aa568ae28d93d994f721a2f9c31cab537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6C 5420 bytes
font_01_sfnt_off000081bd.bin
3df99c9c83561874a40288f4b19a0cb2a4656a0885da1c7b81e49e67538dafcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BD 10364 bytes

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