Malicious PDF — malware analysis report

Static analysis result for SHA-256 6145ab9f6fdd5511…

MALICIOUS

PDF

42.5 KB Created: 2020-10-30 06:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 94a75cf330a11b40810c72c6d82ef2a9 SHA-1: 26e6c2038e6dc975a2c09f77ae7740916fcea4b7 SHA-256: 6145ab9f6fdd5511ccd1983eddc54be059758615a123c73b55bd0762638493dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.link/123?keyword=a+practical+guide+to+dragon+riding In 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/1/0479/5498/5127/files/interruptor_general_manual_en_ingles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8081/9902/files/french_to_english_oxford_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f49d51-de76-41f0-bcc2-49aed4727aea/jonod.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/minecraft_survival_things_to_do_list.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/basic_vehicle_inspection_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a46c153-9e8c-43b1-a98c-571bcfbb2f3f/is_ddo_safe_to_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6c0b5f-0b5f-4d19-8b5f-eb5da0909105/37057133024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44394aa8-ad3e-41ef-b1cb-15f5ca8b4346/begivuver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b14b62c-75fd-49e4-8484-4979683d1e1f/how_to_print_double_sided_on_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35bc7b9f-6355-4344-bc97-f60824f52d93/pagitopixus.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/30645626404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9957/3410/files/famezovojigejatofol.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/60525229274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160db57b-9ccc-4ef8-8cc0-abd6ab220bf7/dorujixonex.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_off000067a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A0 5052 bytes
SHA-256: 34cf505c274f45bacba1dc20190557a578442c1c32ff9a86a4712f3e01ee2228
font_01_sfnt_off000078db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78DB 10696 bytes
SHA-256: ae7f936912b312a1e2443314c7f9ebbbc81f80c7b9754549c4cc13a568bf6b65