Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b3429f3494364f…

MALICIOUS

PDF

48.3 KB Created: 2020-10-26 10:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 3d8d5b504db39e8ddca039311a91df18 SHA-1: 281c1d2dbbd7555dc5df1e04c0f05a4f61c17a37 SHA-256: 28b3429f3494364f4206fce4c212e6933ab5f67de5ce045d7f0a607a55d44a4a
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://ttraff.me/123?keyword=gcse+chemistry+questions+and+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_5f927ac58f3c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5f88aca362af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f87140bdc887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f897421ce3ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f8ba1495b52a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f917b3bdc2d8.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/232f5246726a.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/4638621.pdfIn PDF document text
    • https://jekazaveme.weebly.com/uploads/1/3/4/4/134470158/a5a5bd776c9304.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/ripifotenero_kilipir_tawugimagip.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/1/0266/8799/6089/files/download_cinema_box_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7112/7206/files/preventic_tick_collar_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6354/9338/files/4063273638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3956/3686/files/fapexobor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9880/9518/files/unbreakable_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a66af5-6960-42f8-9d9e-09426cb88e73/diagrama_de_fusibles_jetta_a4_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122dfd75-0a71-4d38-bfc5-9929b6f394bf/ruzija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/711161b3-726c-44dd-af26-068fab11f674/xesixamozeganufugagutup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7a461d-a306-41b9-a4ee-624acd4e7022/83863284435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1905173a-bf33-451b-9067-fe07318e9aee/middle_earth_shadow_of_mordor_achievement_guide_and_roadmap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b60c88e-4a39-4926-a648-ab7f698a68d9/well_ap_exam_preparation_guide_3rd_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802ba7ed-cb07-4b7b-bd99-8ef4e2c03619/vagaganazuwinavomugilibed.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_off00007b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B20 5716 bytes
SHA-256: 6e0a89086393a39efc7c24ac7f7f01b7ceeba3552aac1d20c1b8e25d9acaea2f
font_01_sfnt_off00008e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7C 10880 bytes
SHA-256: 00c0867cd119ccbc7e56db1a8fb41791b58750f350e3a661930c5259f3fa3911

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