Malicious PDF — malware analysis report

Static analysis result for SHA-256 b032911622043525…

MALICIOUS

PDF

62.3 KB Created: 2020-10-16 00:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0f2d736049f560dd2beee09edaeea89e SHA-1: bf541eb8295e11c957401a8315db55ccf5e58375 SHA-256: b03291162204352590ef524c1935c3f08934c40374bb1bf3587aa79484c11b00
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as document content, aiming to lure users to a potentially harmful website. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, many pointing to benign Shopify domains, suggests a link farm or SEO poisoning tactic to improve search ranking for the malicious URL. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=contemptor+dreadnought+rules+pdf In PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/somulimezopomab-nolapuxoduvamak.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/dinezufujilo-basejugejenug-sutaweb.pdfIn PDF document text
    • https://site-1039759.mozfiles.com/files/1039759/76176219228.pdfIn PDF document text
    • https://site-1043574.mozfiles.com/files/1043574/tagololaleguz.pdfIn PDF document text
    • https://site-1042549.mozfiles.com/files/1042549/85848823119.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/1/0496/3955/5225/files/85073323951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/tai_chi_moves_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0984/2589/files/wepefupiwevexizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8783/2260/files/cambiar_tipo_letra_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9089/4755/files/jim_kwik_book_limitless_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5882/6916/files/litowiwole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4695/5929/files/albany_medical_school_letters_of_recommendation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3838/7607/files/vefodadutomor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2220/8152/files/cover_the_earth_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8970/2301/files/73739378538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f851320-fb2d-4284-b36b-c57073df77cb/33940626630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150e44df-a19d-4f11-bb30-393544a26574/89016991798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f131ba07-b463-42de-a0f9-bc33a58da371/jesenuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134722ac-146a-4803-a36d-f19c17ad144a/13022536089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72645082-d7de-43da-954f-06ff7c7b31bf/61472152862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abd2a82-ab55-4730-a399-40d6eabe4657/pojotapebofitiratin.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_off0000b28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28F 5360 bytes
SHA-256: b0f33f399a54e7e032d7ad75332442b5779cb1b24d294ab41893a08a98cbca27
font_01_sfnt_off0000c497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC497 12176 bytes
SHA-256: 7b2aa972d57cc03567d9ac5544dc808e10b73d0e66fac403168edd940eca6949

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