Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dc018e55c33bec…

MALICIOUS

PDF

54.9 KB Created: 2020-10-01 04:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 28ba8a6385f7e06a54eedffe909d0804 SHA-1: 31ea5a04f71d54f7f5d10e43e2a68a8eac90da38 SHA-256: a6dc018e55c33bec27f099fb9f0aaee6985712ba6535e5d954f5abd63503c6a0
184 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=andromonoecious+definition+pdf In PDF document text
    • http://fekenunok.gregorytinga.com/uploads/1/3/1/4/131406668/reruvunozagitezufu.pdfIn PDF document text
    • http://gugedora.ambientisolation.com/uploads/1/3/2/6/132695636/1136146.pdfIn PDF document text
    • http://dijow.oshna1.org/uploads/1/3/2/6/132696465/6435992.pdfIn PDF document text
    • http://files.hhsclassof1979.com/uploads/1/3/0/8/130814432/816391.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/ziminukug.pdfIn PDF document text
    • https://site-1036910.mozfiles.com/files/1036910/gesopifojedexibuwowiw.pdfIn PDF document text
    • https://site-1040171.mozfiles.com/files/1040171/89847196857.pdfIn PDF document text
    • https://site-1039332.mozfiles.com/files/1039332/pizebuxuwuvugirositosawo.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/1/0436/9642/3080/files/affidavit_of_loss_sss_id_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0136/2850/files/nuova_simonelli_aurelia_ii_t3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87411c07-7f78-4094-ad18-f8b0ee13e766/vidupov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a14d70-0fc3-4f3e-bfdb-7e4b21c0aed2/mawowelasumebafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91e97cc-2ea6-4580-a0e1-b5015b3e6ac6/bijuforetitarose.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000872a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x872A 4960 bytes
SHA-256: 1ade66352449ced5e711efd9887c24f8760fdb4d7dcf614fcfc69305fcdf2540
font_00_sfnt_off00006709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6709 4296 bytes
SHA-256: 5e4f5bd4c84940f474be5298222ecb36af5873594f30324cd0fd3f27cddd8b88
font_01_sfnt_off00007614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7614 5048 bytes
SHA-256: ddd3d4a814e196fe64a02cac1f3191971fc321313ab653490649b0fc5ecad744
font_03_sfnt_off0000983e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x983E 11152 bytes
SHA-256: a9adc84bb0c1a4da3f13720e057dd04cdcf71bf4cb2f1a93302e23bd86ae3dcf
font_04_sfnt_off0000be8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8A 3628 bytes
SHA-256: 78a44c7d16325fcbd53d13edb3bccc3fd71f1d1934fa9db49fa7842e42f213ac

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