Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e826770d0a2de3…

MALICIOUS

PDF

45.1 KB Created: 2020-10-01 13:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ac37739a482b3124dac87d91dfb2f23d SHA-1: e630cdeed3bcab76ec811d3273eef1377d200d47 SHA-256: 38e826770d0a2de35668c6c939bb40a13791ea8c46f409b68abfeb9243383d0d
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://cctraff.ru/strik?keyword=basic+math+definition+pdf In PDF document text
    • http://felit.unlphimu.com/uploads/1/3/0/8/130874359/3edece8.pdfIn PDF document text
    • http://files.takesomethingout.com/uploads/1/3/0/7/130776208/78a23321.pdfIn PDF document text
    • http://tivolafoz.ccevansville.org/uploads/1/3/1/4/131454120/diguriguz-xogafixanusovi.pdfIn PDF document text
    • http://files.tiavellani.com/uploads/1/3/0/7/130775645/72bdce9bfd5.pdfIn PDF document text
    • https://site-1036907.mozfiles.com/files/1036907/sovelebabunamesa.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/2545503837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2dd0b9f2-4ff8-4c6d-b812-693bd55119cc/34634213086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d824261-7cf4-4443-8932-c985fc140795/kiliferem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dad791a-b8ad-4a43-b830-964a01523ea0/tipadijiwonubunoxelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0635/3823/files/digital_photography_course.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/58565017199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/wukoxivusifudifepubulesam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3802/3586/files/76127451108.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D3 5104 bytes
SHA-256: 2ece658ccdbfa5c8c31adad7975cbfce9f7ebafd1f9eafad0f6be57c0244e248
font_01_sfnt_off00007608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7608 10520 bytes
SHA-256: f354e18de3bb372b00acdf4e20efb79975ba56a2fd3a27db706215a51f92059b
font_02_sfnt_off000099d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99D6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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