Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9389a07d1b54f1…

MALICIOUS

PDF

43.9 KB Created: 2020-08-05 05:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d46bd1d458d8167b72cf9f162999ede7 SHA-1: 2dc94f9e796042bfdbc82462b15af758f9da9923 SHA-256: 3b9389a07d1b54f145bab6975ea8223c1507d3e8d0528f3b718afd12f8de71d5
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.com/pify?keyword=equations+of+motion+problems+pdf+grade+10 In PDF document text
    • http://files.silverspur.com/uploads/1/3/1/8/131858661/4805b405.pdfIn PDF document text
    • http://files.aweebitofsomething.com/uploads/1/3/0/8/130813362/925e12baf.pdfIn PDF document text
    • http://files.marystromerhanson.com/uploads/1/3/1/8/131871480/joxujiroze-lopixoj.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/1/0428/7961/5142/files/new_oer_support_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/8352365767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2178/4472/files/the_crafting_dead_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5845/3928/files/xajinefotitipina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/4g_antenna_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8178/4734/files/open_in_adobe_reader_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/xuwifilajuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4539/5368/files/61738934799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/66217836053.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5739 5776 bytes
SHA-256: 91b23c6f655f4ae2eb3251e874f5ca4e474a7a25a101318d9ac1240d5e20ae2a
font_01_sfnt_off00006acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACC 9596 bytes
SHA-256: dca2cd449a9832f49d1334791ed15d4a958331c3c140636b886bd6308ffbff24
font_02_sfnt_off00008bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD8 16508 bytes
SHA-256: 19aac17df7e625db22c63f07bc3b185ea75a61c6315ad1393cdd6bf89f1362d8

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