Malicious PDF — malware analysis report

Static analysis result for SHA-256 9173b5c8dee3c7b7…

MALICIOUS

PDF

42.8 KB Created: 2020-10-25 09:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: de01518f9a5dd670c4793714e69226fc SHA-1: a2f0252c64062ad43a2d31e4c60769b63a11a49e SHA-256: 9173b5c8dee3c7b77febcfd26c937a9333183eb0a60d84f7bdd8a53e969e2766
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://ttraff.me/123?keyword=google+camera+apk+for+oneplus+6+download In PDF document text
    • https://gowewibejeji.weebly.com/uploads/1/3/4/4/134481286/cae1b2654948e37.pdfIn PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/femukane.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/newukaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000064c7.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000064c7.bin)
    • https://s3.amazonaws.com/gurowozenupifi/divozobobekesusa.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/78252011527.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/el_fiscal_augusto_roa_bastos_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/degukesagome.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/ancient_indian_history_mcq_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/vowazabedidezunorodot.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/curriculum_and_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/cell_cycle_principles_of_control.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/nefovidikepolagojaroxe.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/clerical_ability_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/sagevovevovixazovoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/malawenunitugitomoziv.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/autism_diagnostic_criteria_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcce431-5470-4f77-ba88-d430e8dadc20/debijukubodufob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f04f836-7dbf-40e6-8b94-7592cab8d863/juzejifajaga.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 extracted file (font_00_sfnt_off000064c7.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C7 5816 bytes
SHA-256: 622cdcd76e6fc636036f55f17e4cfa4bb6ffaac2114abfe4a8d929e8b523d4a3
font_01_sfnt_off0000789e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x789E 11160 bytes
SHA-256: a4f32a34414e2546b465eb956c49fe4b704baa6ed4f57075ac8c194283ca6bec