Malicious PDF — malware analysis report

Static analysis result for SHA-256 4022f9e8f5a37dab…

MALICIOUS

PDF

42.5 KB Created: 2020-08-09 10:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1281b7ff394953305ae93a2b25c0327 SHA-1: 1bee8c33d738a064f49d61089e873c03dc3aa250 SHA-256: 4022f9e8f5a37dabd77f29cd3de2892753b31aa82af39011a618849ebf9828f8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily corrupted, appears to contain text related to a UN resolution and the authoring application, suggesting a lure. The presence of numerous external links, many pointing to Shopify domains hosting PDF files, indicates a link farm or SEO spamming attempt. The primary malicious URL is https://ttraff.ru/pify?keyword=resolu%25C3%25A7%25C3%25A3o+2020+da+assembleia+geral+das+na%25C3%25A7%25C3%25B5es+unidas+pdf.

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=resolu%25C3%25A7%25C3%25A3o+2020+da+assembleia+geral+das+na%25C3%25A7%25C3%25B5es+unidas+pdf
    • http://files.whitele.com/uploads/1/3/1/4/131437889/movazenesupeje.pdf
    • http://files.cikrefurbished.com/uploads/1/3/0/9/130969987/2256908.pdf
    • http://files.nancysniftynotes.com/uploads/1/3/1/3/131398253/9743245.pdf
    • http://files.vantagepointchiro.com/uploads/1/3/1/1/131163599/9954237.pdf
    • http://kofiwadif.pottersaddict.com/uploads/1/3/1/8/131856372/xovozesexemusim.pdf
    • https://cdn.shopify.com/s/files/1/0428/7204/5734/files/list_to_string_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/1932/0992/files/sansui_television_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/zitari.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/refinugurevodinuzexavirag.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/zovipetapofufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/revista_atualidades_2020.pdf
    • https://cdn.shopify.com/s/files/1/0445/9751/0308/files/logical_reasoning_questions_and_answers_for_cat.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/30768421049.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/49208867932.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/todukuwiseluvudadi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9504/6824/files/46712604148.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_off000060fc.bin
84120ffc32646b9023c2b4a6a9383139108f734ea4d9c2c031225e0f5be3ddd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FC 6500 bytes
font_01_sfnt_off000075e5.bin
fe225f9216353094f72c5f76c911941a63f74ab5502e8228683f187060774818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E5 11944 bytes

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