Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6108edb6a07a15…

MALICIOUS

PDF

45.3 KB Created: 2020-10-01 22:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 82d2b6ce5c79d8649ec5557f341ab366 SHA-1: a89f3140742910457674c6210a97b7427e2c5653 SHA-256: 7c6108edb6a07a15dbc52dad2070e84812e2ffea9902d54ed654964e396f9584
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of the primary links redirects to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links suggests an attempt to lure users to malicious sites.

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://gettraff.ru/strik?keyword=target+with+alok+history+pdf In PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/bezafesasofevemixik.pdfIn PDF document text
    • https://site-1038317.mozfiles.com/files/1038317/gagepajorutevepij.pdfIn PDF document text
    • https://site-1039830.mozfiles.com/files/1039830/78544188467.pdfIn PDF document text
    • http://jofup.schroth-barcelonainstitute.com/uploads/1/3/1/4/131437849/tewunotijuvez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/a593e74e-75e9-42ed-a1df-f6e2ebe87a5b/tobolelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495a682c-0394-406c-ab58-2013671acadc/visuvedesuvimulusugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7362987-0f68-4e72-be91-d10fce68eb8d/9995007021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d973545-790f-4c15-9920-0c7ec1270d90/zutugaguloluwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0484/0096/files/bosch_dishwasher_manual_nz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1512/1307/files/derp_face_emoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9419/4843/files/lewes_yacht_club_login.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3A 5512 bytes
SHA-256: ea549166067b139a6622d91762440d4846d9b7b2ad6f54b5b4c4258a58518f2e
font_01_sfnt_off0000710e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x710E 11012 bytes
SHA-256: 62078f644bc55aac60d5529a43e9c11a29c9913c4e0de05004d09e9de140542a
font_02_sfnt_off0000955b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x955B 5308 bytes
SHA-256: c1a15dd2480b6f8b7f75bf669ab0e3495060fa49dad7f5f147581eb612e98227

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