Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ce2822a910bf39…

MALICIOUS

PDF

51.7 KB Created: 2020-11-01 12:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba1f0f64eb78a203fcee2abae800231a SHA-1: 55cddfea19959200dcfba78e83fdd22f7c0f581d SHA-256: 25ce2822a910bf393299d6e33582aaa99ca926f0dbb4137fd96a447067dc72d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms, indicating a malicious intent to direct users to potentially harmful sites. The ML classifier strongly supports this assessment. The document body, though heavily obfuscated, contains references to 'Pampers underjams size chart' and URLs that align with the heuristic findings.

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/wb?keyword=pampers%20underjams%20size%20chart In PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/fulugubu_devenujopu.pdfIn PDF document text
    • https://woxejisuwu.weebly.com/uploads/1/3/4/3/134322210/gemewa.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/vovofofaverun_sawivurovoj_nifawubazox.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/2495428e-5305-444c-8ca7-5d7d5a21e2d4/art_appreciation_final_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512a66f9-1d4a-43e6-bb9f-7d0223de0129/xixexododanunevuxukolena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/9871/5320/files/kegixixeguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8742/8291/files/csr_2_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6867/7016/files/tvfplay_apk_file_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7e3627-0f4b-42e9-9bd3-431b67144488/26181552794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59836206-0f67-4f71-b2e8-538139000d9c/2914330540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a90642-f749-42c3-862b-0c00c1969cac/vopewadep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0182/5448/files/assistir_filme_velozes_e_furiosos_8_dublado_completo_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0614b6ab-28d5-4470-8566-201552017d4c/zanipujupiletinivojap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139ba2f2-8883-4e05-a248-7bfbc2c1d2c4/40711214124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee18b06-80f4-4f11-bf38-fc2eb3d5a1d8/nemevemitetolobabu.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_off00008ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE1 5408 bytes
SHA-256: f085fe8a1424dc973e98d42065ffd48ac585a24a1f91616aef613218d603df8f
font_01_sfnt_off00009d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D28 10860 bytes
SHA-256: a8195acc130369564fc9f8ad5f24414803c40cc145c396adc8e17383cd5a18ad

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