Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a77e6ed9aa4f39…

MALICIOUS

PDF

40.7 KB Created: 2020-10-16 09:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f5cf5420f18e881e93a4b02f17f416a2 SHA-1: ff8a347144db33bfda5fb7460f3b4b03ecdc4bb4 SHA-256: 71a77e6ed9aa4f393eacb6cfd44a47fb9f289b4709cc956859fb76e4173f8ce1
274 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gettraff.ru/123?keyword=web+designing+software+for+android In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/ea1eadc07ab.pdfIn PDF document text
    • https://fifowekuvepu.weebly.com/uploads/1/3/0/7/130776735/7878700.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f876061a7cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f88910eacc2b.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/9051060.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/tibepiniji-pegipuwin-sagexuj-gubojizivodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f8914eda74ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8747ae20e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f891cd5470f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5f89190bba80b.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/1/0430/8389/0850/files/game_android_ringan_untuk_ram_512.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6146/8571/files/98866487468.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_off000062a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A1 5288 bytes
SHA-256: 02463c6ddad1ca24e58e06e898c2805429b178be0a6b0a28e9e1904305ac253e
font_01_sfnt_off000074bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BF 9772 bytes
SHA-256: d876aa8d8b27566fd2cfc8467aff55f67d26d9185c94de5ff317b5592602b206