Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05a4ca11e7d847c…

MALICIOUS

PDF

36.6 KB Created: 2020-08-07 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9da0479d9d8c5e89dc1c7b5bc9ced189 SHA-1: ea4d9b93317de16e8719c140f20f667f9ccfad22 SHA-256: b05a4ca11e7d847c2e910c8e1f8aadeda8c98886d165e975ae3de55d31363750
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to improve search engine ranking, with one primary link redirecting to a known malicious URL. The document body, though heavily obfuscated, contains the text 'basic life support pdf free download' and the malicious URL, indicating a lure to download content that ultimately leads to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=basic+life+support+pdf+free+download
    • http://files.acubyang.com/uploads/1/3/2/6/132681882/nubijetatepere.pdf
    • http://files.duanebrownlaw.com/uploads/1/3/1/4/131483253/2887604.pdf
    • http://sawepox.mcatoncreations.com/uploads/1/3/1/4/131406149/9500600.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/94312768278.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/associao_brasileira_de_normas_tecnicas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/90285108792.pdf
    • https://cdn.shopify.com/s/files/1/0429/5871/7087/files/assembly_language_programming_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0448/6055/files/bihar_daroga_previous_year_question_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/61548814737.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/51156932819.pdf
    • https://cdn.shopify.com/s/files/1/0440/6660/3158/files/7979674765.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/xemoxolinajis.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/kuduwozasipibusujemoroj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6883/1382/files/blow_moulding_design_guide.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050d7.bin
35b0a6187d69d4653641f7b5ac19bfcdb471644e278f848dd9b17ecf11d2e84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50D7 5288 bytes
font_01_sfnt_off000062f7.bin
097ff3fe439af41fff09c5190c41e3707b5f421daec300903c1b9c50fffd38ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 10080 bytes

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