Malicious PDF — malware analysis report

Static analysis result for SHA-256 e823700e4bd9922e…

MALICIOUS

PDF

32.0 KB Created: 2020-11-05 05:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 63182461431a1942cbd7e62bd2ff0d3a SHA-1: bbfe7c4b32e72d098631b8f8b5cef5fe309fb40b SHA-256: e823700e4bd9922eb5ee57c5a36ffd16d41f50ca2575eda18d33d9d2371f42c8
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also strongly flagged this sample as malicious. The embedded URL, https://ttraff.ru/123?keyword=inverse+functions+practice+worksheet, is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/123?keyword=inverse+functions+practice+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f96e9162c55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f8760d6f0521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f9326440268f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f891121e1208.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/dafifakem.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/e5b159ca27cda3.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/a4d1b1c9-472e-4bd5-b470-a133a0bec6ee/xujadofegekukoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4206/0460/files/wemikugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2daaad56-9f05-469a-bbdf-e9209c251f42/pipurovamewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2552e191-1fc8-4cce-b048-9b91e6e13c37/discografia_marcos_witt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac8cb1b-1d77-4086-a422-7c179994c8f9/95173044454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3847b1f5-b48a-4698-9334-cf84a7b4561d/vusurepuvulurajaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1050c50-50fa-450a-a0cc-27be0b5dca3b/exercice_corrig_diagramme_de_pert_et_gantt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b50327c-41cc-40d3-870c-52d9ba197f26/zowepuxebadi.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_off00004348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4348 5224 bytes
SHA-256: 68813edfbdbdd86ee31db4fcd39e574a70440d807c2a50f78fbbc9452800d08a
font_01_sfnt_off00005525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5525 8912 bytes
SHA-256: acc0190a749448cd6272400d5774c8b5b0707724b629eb58b9986ed8dd52017e

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