Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcde49c08ca4e1b…

MALICIOUS

PDF

66.9 KB Created: 2020-09-21 14:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d46cc0179686d89b335f57b2ce3ca544 SHA-1: 22c958ff186b57112e8f358096696d1f4f8df20f SHA-256: efcde49c08ca4e1be2527e5f8ac559d710e6c56f3892e7be543077211a0cc73a
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.club/wix?keyword=exponents+and+scientific+notation+study+guide+answer+key In PDF document text
    • http://files.hannahdarcy.com/uploads/1/3/1/3/131381540/87d6fdf210fdad.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/1/0459/8824/9757/files/enthalpy_of_reaction_problems_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/lijojosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/rurunikodewizewitomuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5395/4725/files/53929567020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/62293872422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/us_gaap_revenue_recognition_old_standard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/aprilaire_thermostat_8476w_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4692/0615/files/15253879836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/kpi_for_marketing_manager_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/18678559939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/minecraft_font_downloads.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/winamutulipodam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8572/5850/files/xujimizaboluwa.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_off0000a26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA26E 5576 bytes
SHA-256: 364eef7901f0fba5d0fd20a6afe0a20fa89335ad1fcf91baf0625be08345a5cf
font_01_sfnt_off0000b5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A4 16444 bytes
SHA-256: ef3b8e5903930df35ab69d47621f328fece73e37dcf69c2921c18837e498002a
font_02_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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