Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fb7f02dbe1197f…

MALICIOUS

PDF

45.2 KB Created: 2020-09-30 10:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b97828b410a11a3fa1d7bbe7a74994b3 SHA-1: 23897bc22ecf440ad3f04c7562b2226a91cbaa4a SHA-256: 28fb7f02dbe1197f910fc324a7357b2c359fb9c6d4f2437f364b19709216d3cd
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/strik?keyword=bpsc+pre+syllabus+2019+in+hindi+pdf In PDF document text
    • http://rawudube.universeresearch.org/uploads/1/3/0/8/130813458/4129462.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/1/0429/2050/9596/files/android_custom_horizontal_progress_bar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/film_korea_innocent_witness_subtitle_indonesia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/8289/4750/files/44837972947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0663/1833/files/8640975635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb5de66-512b-4534-98e2-f0d5ed22ad6b/felofevuwebifasike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7981a95c-78d9-4ada-ae4c-77d114eded14/wowiwenilafuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82750db4-8eb4-4ca2-86e3-edf0ed3eee34/bajopapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a52760-86af-470f-8f14-cdb7ae196e1a/tawuditibabaribasixejidoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300031cd-9fad-49d1-9264-3e4e9ab6a5cc/pameraguxuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/blasphemy_law_in_pakistan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/kekuwutifixexugavosofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/31447767482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/gadajenililubonulad.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_off00007105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7105 6016 bytes
SHA-256: 6ef952337f295d3e9d7b3eae3e907eaab3ed60f55a19c669a6b8f84ce67e8bb2
font_01_sfnt_off00008576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8576 10188 bytes
SHA-256: 0f3117799c64a020665394219b74adf538553087a52fe6d0f4025eb14f5eebc2

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