Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53eb612ff2d1ca3…

MALICIOUS

PDF

37.3 KB Created: 2020-10-03 04:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 749ef11980343d693911a36c12bb33af SHA-1: 5663040ef1f0a96c65c11b67b3bc42bc09c02c0b SHA-256: d53eb612ff2d1ca30029774b5139b4c099f212f7b17a9874666531c058203ffb
154 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, disguised with a search query for a technical document. The ML classifier strongly flagged this PDF as malicious. The embedded link likely leads to a second-stage payload or phishing page.

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=solucionario+de+mecanica+de+fluidos+mott+sexta+edicion+pdf In PDF document text
    • http://nokegok.bucklesandbeads.com/uploads/1/3/0/8/130814328/5987729.pdfIn PDF document text
    • http://files.carltonhoa.com/uploads/1/3/0/7/130739978/9970730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a9acd214-cbb6-4282-8569-288e2c7a95b1/luboda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9745e7e5-ee76-4256-bd05-8d72540f54c5/vojekeditoded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c39ada-92ea-455f-9f0c-9b78b9aa425c/givuzuzexedijatejewabemoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02aa594-4145-445e-82d0-2552b706e185/zubuziremizipaxives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c87cfce-5641-4427-b143-e4dfe99930fa/62841769848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c66ae2-fd80-44c6-93b4-80db1c58f563/36453374118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37bbe23d-b25d-4209-b7f0-463be6f585c5/10294395298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064c52da-6582-45e7-b907-735b249e6e80/76355646147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f31b61-ae34-47ab-93d0-d5afd6432676/piputuvavurakevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf25e3f3-a5c8-4bc4-931b-e16ced2f25c4/pekizavogiturotire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468bdea7-0336-4338-a6ed-a004fc14112c/xerixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b373c8c-f796-4061-b9fb-aa0c234ae01b/997351092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dec596b-1557-4acf-ac97-cda9586ce4ce/mixuvesoj.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_off00004750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4750 5352 bytes
SHA-256: bef8523f7df61aa95d615ad693fb0fb38371bb8addd53acb0693f89f01953f12
font_01_sfnt_off00005961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5961 9860 bytes
SHA-256: 93067eeafcf5b1b4a0938ef671afa12e231d6c1599a0433f127fd79056ed382c
font_02_sfnt_off000079d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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