Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac5da8442575936…

MALICIOUS

PDF

36.4 KB Created: 2020-10-31 22:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d858b4fdab04a155d1688d3ceb122d12 SHA-1: 6cd078027229b8568d970c165f7faea8784e1667 SHA-256: 7ac5da8442575936b2e2e9169462bb7991442fc40159e52c574e6c3de4b7683a
134 Risk Score

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.
  • 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://cctraff.ru/aws?keyword=lu+factorization+calculator+3x4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_5f8f6557608ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5f9763b46a1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f99092abb693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/air_hogs_helicopter_car.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/wudekufemotifetasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf99dbe-f599-4866-b34c-b5891820ccbc/actividades_para_3_de_preescolar.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/lotodesovutufari.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/puriz.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/a_l_aburrir_clases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4feb288-d751-4e96-a7c1-51331fb3c76f/colt_new_frontier_22_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797a316f-a198-4d31-8562-27bd697e0743/wobizekafudem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5990/2624/files/89943688616.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_off00004e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E76 5008 bytes
SHA-256: 79508cdfa22f523d4a84d8782c6306b91eec7991cc2f7e234408ff1e02587064
font_01_sfnt_off00005fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA9 11060 bytes
SHA-256: 26cc0f7f7313f64082df1fc914cb8ec1f378aa1efeac400780570fef48954b7e