Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d27b449c6c330b…

MALICIOUS

PDF

43.5 KB Created: 2020-10-22 00:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 1a6d484ac8f772bfa0801f8c2655ab77 SHA-1: 627b9a44e2222a0cd6451bb36873887cacde0468 SHA-256: b3d27b449c6c330b69f5398db502d4131c9719f0a881ac96d6dbe770f9346b93
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=malayalam+new+movies+downloading In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f8db729ef3dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5f8f05f036e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f8c42a010163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870bbc02871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8e77fb21f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5f89f43c69964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f8fa00daab8f.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/leguvefu/bread_making_process.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/antrenmanlarla_matematik_4._gn.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/english_grammar_possessive_pronouns_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/nitro_blackout_text.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/menopararerenutovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9302/4151/files/number_the_stars_movie_youtube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8997/2385/files/mafumetulepikevovof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/7038/3014/files/notusalida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5794/3206/files/tiefling_eye_color.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0913/6024/files/chemical_properties_of_carbon_compounds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2392/4889/files/soal_jangka_sorong.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_off00006be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE5 5308 bytes
SHA-256: 667298fd00373fcfe60226c5e0aa4987c1b4352a596ca80b17f864bace09a24e
font_01_sfnt_off00007e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E06 10268 bytes
SHA-256: d364d36789c3f54e90f7f1963b196732b6ad9a6e7dab6b21fecdd6e73f7d6ddc