Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f4c7836bb3896c…

MALICIOUS

PDF

35.1 KB Created: 2020-10-16 10:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c961bead052595d4f97ff99bfb4e9caf SHA-1: cda820a9aed5e230db2cbcc48659e1bca40a5ce5 SHA-256: f6f4c7836bb3896cb40754c81a12f20a1aec2ef02b88f6f11500f5507a4e2086
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://ggtraff.ru/123?keyword=uv+light+app+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f89347fd34d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f89168d09ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f88bb8b9f4fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f894215132ac.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/5173378.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/depeviteroxovasagela.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nimemoroligamaj-tafixidupara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f8924bb75ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f87596337098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c707b5-5588-4eb1-b1c9-6e555912dc89/28609401320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4891cf46-c138-48e3-97c5-ae029759d159/tusafufuzabepopegir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a9e9d7-c960-4f03-b88f-da6a50a79e05/pabunudekapebuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6a6048-0bab-4977-aaed-3b488bf9c535/zuzobijidenididumevimonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02202b3f-6e92-48e0-8070-01deb17fe11a/6498427171.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/consolidation_worksheet_and_elimination_entries.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7528/0552/files/solutions_webquest_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4893/4819/files/81953827041.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/if_clauses_spanish_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3842/9343/files/47480776427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aee75ca-76b9-40f9-93a4-e42b9aafe5ba/51273959306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f5ab33-3a16-40b3-af9f-016018acc2be/51075164333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4d27f6-a90c-4e02-86dc-b0000a8e09e0/daromogevafukakadevakip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b22084-2fda-4117-bad7-ae4a3b224f18/75078496068.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_off00004de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE1 4920 bytes
SHA-256: b9a1e1322df42e4cd71f777689f49927d89cb4b192c9b5d60f858b478589acf0
font_01_sfnt_off00005ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA7 9628 bytes
SHA-256: 0bac3dfbeb2ee05821eba48133ee243854e2d567174e26b3c168b2bdf9992fa7