Malicious PDF — malware analysis report

Static analysis result for SHA-256 5497dff08e2684f3…

MALICIOUS

PDF

39.7 KB Created: 2020-10-02 01:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: b3642931a8f9f89a7039114d5075d9ea SHA-1: 5b32afb6bae1f79d20043aafb109a7ad41bc3cf1 SHA-256: 5497dff08e2684f312b35332bd326bf60c7086e69e851f82afa36439b446af78
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=past+simple+exercises+irregular+verb In PDF document text
    • http://files.russkeeneylpc.com/uploads/1/3/1/3/131398498/fegadix.pdfIn PDF document text
    • http://gutegaje.juliablackstock.com/uploads/1/3/2/6/132683252/napoteluvadezak.pdfIn PDF document text
    • http://juvovufe.bremermountainbaskets.com/uploads/1/3/1/0/131070045/4726632.pdfIn PDF document text
    • http://files.rairasensei.com/uploads/1/3/1/3/131379874/jibub.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/1/0437/5468/4565/files/tudetularibuxatuwub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0056/9253/files/3333726996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/kowebimuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6546/6266/files/99719128984.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9423/9141/files/40920801169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4610/3961/files/92515536873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/60972759365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3677/3018/files/52107397929.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9897/1043/files/ronane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5190/4924/files/tokazadepilivif.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

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_off000049cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49CF 5520 bytes
SHA-256: 8d25688f9ef3b9c5b33bff1de96f4a854aea1cc6b733114c69a9d9e504a663e5
font_01_sfnt_off00005c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C82 9516 bytes
SHA-256: c4410882f06893be63a6324b3ed5cb7ce916d6fa793ed767a6531a5e189bcef5
font_02_sfnt_off00007d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D28 16060 bytes
SHA-256: 9fce2e558c7eba93e9b4ba87b790c422cf9490aab73fe875614431ac3e7f116a

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