Malicious PDF — malware analysis report

Static analysis result for SHA-256 053b1338231b4f55…

MALICIOUS

PDF

71.7 KB Created: 2020-11-18 04:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 16c861847c1267f283d571c8abbdbe14 SHA-1: 57780969d72fc97096e02f0c34f618d7397c6780 SHA-256: 053b1338231b4f5579b3a56b25b26b27dde4a6b540a406fd71e9f39ba2e6282f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several heuristics indicating a malicious redirector and a link farm. The ML classifier strongly suggests maliciousness. The document body, though heavily obfuscated, contains text that appears to be related to the 'Words for strength' lure, and the presence of embedded URLs points towards an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=words+for+strength In PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/8911703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5f914dd729868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f97cc364c75f.pdfIn PDF document text
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/4063476.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/362a66f0-d93c-40fe-9ab2-6a5659d5dc42/46242941987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edef7d22-6ddd-47dd-9bb9-b3073fd63312/tuzalefamukegowixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af754535-2955-4def-9da0-aec4f0c0d93b/kuzodazum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76f4909-6fca-4c25-801e-55306ff201ab/elephant_quest_armor_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea60328d-1ae9-4e66-bc6f-f54a1d3d58e9/examen_de_excel_avanzado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368edb55-b8d2-4a99-880a-6166beb8ab8d/botiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb52a55c-0114-4a80-bc4f-17182e2cf4fb/25055901328.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/55886861115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90adda0c-ed0a-4548-af8c-42ff32c5fc70/vending_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/nmsqt_semifinalist_2020_maryland.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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 4940 bytes
SHA-256: 4ae78382ee58e9b8cf32fe0d51f02448359440b193cbba27b2942df224273a1e
font_01_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 10368 bytes
SHA-256: 39711aeb8b6cd19fc702fad83a60c12d32ee6a004723bcfadc8c31dbf5a40468

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