Malicious PDF — malware analysis report

Static analysis result for SHA-256 4436c55c5f6afc29…

MALICIOUS

PDF

36.7 KB Created: 2020-10-01 17:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 7c7039f1e971e8ab7644032362b1a623 SHA-1: 7d39294a6d7b90f18f3bed43fe8c7b6cc927e84b SHA-256: 4436c55c5f6afc29230bffa9de749536ad1b3b430591d4110a7f026973b4f1f6
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=mind+power+techniques+in+hindi+pdf+free+download In PDF document text
    • http://files.emilymabbott.com/uploads/1/3/0/8/130814408/f2ae90a91bf5b.pdfIn PDF document text
    • http://files.polyglotph.com/uploads/1/3/0/7/130738971/21c3c.pdfIn PDF document text
    • http://dukuwop.boathousetx.com/uploads/1/3/2/6/132681542/2433469.pdfIn PDF document text
    • http://files.citinature.org/uploads/1/3/0/7/130776688/jovunu_kabimiziwumo.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/1/0435/7623/0051/files/rpg_maker_android_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9695/1969/files/avengers_endgame_streaming_release_date_us.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/jurebijo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/9727/8614/files/pearl_from_spongebob_squarepants.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/tattoo_machine_tuning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e5aa2d-d5a0-42a6-99ea-3ce7365fdcf8/mewiwelominarobavavufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed1d510-ea76-4723-85a3-d233a7e7c29b/pawivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e760462-5e32-44a1-957c-6b0c9362e0cf/49909263056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3fe576-9737-4fbc-afd4-1e4c0c7b2865/54239008069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dd1645-3b08-439d-96a8-d9a2cf320504/85173166769.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9074/2947/files/realidades_1_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/9840/2719/files/agency_by_ratification_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2882/3719/files/the_raid_2_watch_online_dailymotion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1197/6611/files/tewoped.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_off0000548e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x548E 5464 bytes
SHA-256: e52f5c901ff1125bdad922fece41845bc582fdd27ee791f87232b42ef759f4da
font_01_sfnt_off0000673e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673E 8936 bytes
SHA-256: ec14e7643e2b716b2d77fcec5a62aa904f79e42c668e21335ae762644879ef65