Malicious PDF — malware analysis report

Static analysis result for SHA-256 959ac559dc8e988a…

MALICIOUS

PDF

58.1 KB Created: 2020-10-09 21:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: cbaab937256d6c4c18f2b8c6634cd25b SHA-1: 75d241fa07a1d670ae23c94276748a21a272c37c SHA-256: 959ac559dc8e988ab1dfc071ff78ad621bd0cff8c289828b6ebb3f0a6c0eaf47
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=period+3+ap+world+history+vocab In PDF document text
    • https://site-1038901.mozfiles.com/files/1038901/64999503793.pdfIn PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/4060411078.pdfIn PDF document text
    • https://site-1037899.mozfiles.com/files/1037899/lidupijag.pdfIn PDF document text
    • https://site-1039995.mozfiles.com/files/1039995/41602422703.pdfIn PDF document text
    • http://files.omlalawyers.com/uploads/1/3/0/9/130969742/wixunuforeladurefoje.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/ferejipokiguja.pdfIn PDF document text
    • https://site-1039472.mozfiles.com/files/1039472/35026189867.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/1/0431/6296/0023/files/61937857525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3739/4597/files/seward_park_seattle_weather.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF8 5720 bytes
SHA-256: c05e50af48588ca593a40bf8a246485839e123f45ee1efc9f6ba8fbfd3d3aafb
font_01_sfnt_off0000727d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727D 12304 bytes
SHA-256: ea67b46d94cc11f4fb224c5b474cea2704660e4671feadb921b18747e970b42a
font_02_sfnt_off00009948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9948 10184 bytes
SHA-256: 1e366b4acae2a336b16850d94136ca3d6f2dba272dc826cfb7bf004e4c141243
font_03_sfnt_off0000bc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC48 16120 bytes
SHA-256: 2908c71a73812f4dbbe924f85feb1de9e16d69baa71a945eb870efde3fff0373
font_04_sfnt_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19