Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea71481f921732f0…

MALICIOUS

PDF

54.3 KB Created: 2020-11-02 11:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: cb5080af39d35e31f17790e3fe2bd7df SHA-1: 1b35e33ee50521a4498f0cf33c7be8eccf9229a3 SHA-256: ea71481f921732f0d2c86fa66e2a1fbbe6eb5675bdff39c79df6afcb6a14ded3
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.me/123?keyword=animal+cell+worksheet+answer+key In PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/c3233b55.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/xejofereg.pdfIn PDF document text
    • https://wimejevufafej.weebly.com/uploads/1/3/4/3/134379448/didojiwoxaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00008756.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00008756.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off0000be0f.bin)
    • https://uploads.strikinglycdn.com/files/df8448cd-8cd5-48e3-848b-6b0defe88bc1/92703371530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e22252d-b1f4-4538-b76c-1cc1c9d0d080/rubizekugiloduv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/0010/3834/files/80123595198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5083a74a-5adf-4ccd-8511-8ea5a33aed8a/pazarugeraxajodafukovavep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ef74c3-033c-424d-ad08-79ac4e3d795b/33369654494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e958c4-9e30-4395-9931-7ac920c91a6a/xadeluxutuwesirexuva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/5360/1735/files/nepaluliseromiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4c2582-250d-4f9f-955b-3ce951c4e3ff/63190752529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3301/6495/files/zuwimagokisazidun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9902/1205/files/83201895594.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 extracted file (font_00_sfnt_off00008756.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8756 5076 bytes
SHA-256: 52f10cfbc27a8d864b77aa2300d2a930f2dfa50719c2789992ab1e4ec896781f
font_01_sfnt_off00009869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9869 11080 bytes
SHA-256: f2ec229e721b76b793e83adca875370676475807a0a799aaccb0ff786da91c0d
font_02_sfnt_off0000be0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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