Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef23ca85438e454…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 21:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 44ae2864db477d101596f33f32a93177 SHA-1: 38e0847e69acfa3f38c63fce336a82fbe80b0694 SHA-256: 0ef23ca85438e4543f6aa4c327b1106be4da61f7e28e98a9424c725788b9f166
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=american+horror+story+episode+guide+wiki In PDF document text
    • http://files.patriciagodden.com/uploads/1/3/1/4/131483019/5adf2.pdfIn PDF document text
    • http://pidomor.saturnfireworks.com/uploads/1/3/0/8/130813747/2082984.pdfIn PDF document text
    • http://ritok.nonstopinterior.com/uploads/1/3/0/7/130776407/d7c657c462b10.pdfIn PDF document text
    • http://dituve.mplsvintagemarket.com/uploads/1/3/2/7/132740718/xafefamewila.pdfIn PDF document text
    • http://files.emilyjaysee.com/uploads/1/3/2/8/132814071/a10f3fd238.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/1/0430/1655/2605/files/dunasaguxarutiluxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5430/1338/files/tevigonuwuxifox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/4313/2316/files/general_awareness_for_rbi_grade_b_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1657/5383/files/david_grand_brainspotting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/6677135976.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5493/0839/files/3247977252.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1729/0407/files/new_boyz_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/99483160337.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/bonufoviwikazezegewaseb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/swellinfo_st_augustine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9212/3556/files/91350828941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9529/4101/files/59928201908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/gudij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/jatetedotazowopisutido.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_off00006e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8B 5704 bytes
SHA-256: ca98c5f0df42bca41c22860c7e3d1ddbb4af2669f93c042a1e4cde83fe2a6cc9
font_01_sfnt_off000081d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D2 10192 bytes
SHA-256: b421046dfc050e24ff4b9d1a940c9a5063a0e4f56caa8605d6b55640ce4ae297

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