Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b426ae6c464fcdb…

MALICIOUS

PDF

44.4 KB Created: 2020-10-02 18:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d00bc205b325c4afa24896b464ec7dd4 SHA-1: dd1f5f6e4cf6c4bd3f49edd6373c5f8e9947cf6c SHA-256: 1b426ae6c464fcdb7d862a761ca5d5dd343faa471caebdb1574718e5d602e43a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector 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://gettraff.ru/strik?keyword=backgammon+pure+strategy+pdf In PDF document text
    • http://serujunip.decemberschildrennd.com/uploads/1/3/1/4/131436972/5639256.pdfIn PDF document text
    • http://files.niagaralearningacademy.com/uploads/1/3/0/8/130874533/6415350.pdfIn PDF document text
    • http://files.victoriasmithmusic.com/uploads/1/3/1/3/131378919/levakufenejugo.pdfIn PDF document text
    • http://vigux.leadsolutionss.com/uploads/1/3/1/3/131383761/saxunigodu.pdfIn PDF document text
    • http://nazomife.senecastpatricks.com/uploads/1/3/1/3/131398104/newonirado-bezaguvudeda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1671399d-c0f4-4a1c-8a04-699b58c954eb/27851636431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e31a1c-4190-41e7-9f34-99041ca76b15/nubarebuwugenok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b76fc1-7907-476a-8b91-d42c2d1b1b40/tekuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7108/1114/files/porque_es_importante_la_economia_en_el_mundo_de_hoy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4475/5866/files/nuvojojugumonekuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7492/9308/files/harborview_animal_hospital_port_clinton.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7971/3177/files/pudof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4226/3199/files/55148838776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efdb702-0e65-4eb2-87f6-7608a8aab650/49878030904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a5232b-5fd4-42b7-9784-40c1700bd9f9/12692885491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0b491d-3cad-442f-a596-5f2d7e0c08b0/korolalugisep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e7e822-9f71-4bc2-81e6-5ebb03a45a19/kesaxusikomareruburif.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_off00006478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6478 5656 bytes
SHA-256: b6b6a3b50848a9b5c5ced0cd341e1e815aa54803173c7a857a835241f240fe6e
font_01_sfnt_off000077ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77BA 14804 bytes
SHA-256: 16f253456e82a87e8c92e30ae8694ca6db89966c24c94985a7c84e5c57690c5d

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