Malicious PDF — malware analysis report

Static analysis result for SHA-256 d992e8ce7de293ab…

MALICIOUS

PDF

40.6 KB Created: 2020-10-01 06:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f65f882daef4510f836c7772060192c4 SHA-1: 382ed215f3a98d03f66c9a8d33a1365f7cfb1d84 SHA-256: d992e8ce7de293abd8fc914bf8772f5dee2824b4a00bf1ab982c822544baaad2
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://ggtraff.ru/strik?keyword=ccna+voice+study+guide+pdf In PDF document text
    • http://files.illinoishotels.org/uploads/1/3/0/9/130969306/727f7f671.pdfIn PDF document text
    • http://files.arlordpac.ca/uploads/1/3/1/3/131383426/buzip_fitewewasalawes_dufufekelul_sekigibulumazi.pdfIn PDF document text
    • http://files.nponwheels.com/uploads/1/3/1/3/131383407/xakovemobekepumo.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/1/0433/0668/0484/files/alejandro_magno_libro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/45167033483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/kijezonoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/zumozufededoganotifivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/kekajalepekud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3873/6284/files/10857387395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/wipezikulazejise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0034/0381/files/zabitumexateg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/kikugadewukadanedim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9064/1047/files/xevojesaxekerovosesum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1248/7325/files/avengers_theme_piano_easy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1412/3428/files/43889380843.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000602d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602D 5264 bytes
SHA-256: 15a3e2ab00def16d491c3ee840b7ce3f5f2c34d0445866df2a7fa7ab1088b674
font_01_sfnt_off0000723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 10584 bytes
SHA-256: 1e850c8a125ce8873f833914c6c467669b34d61e6ca59f3f8695b35372b5dcbb

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