Malicious PDF — malware analysis report

Static analysis result for SHA-256 1047efd977f80812…

MALICIOUS

PDF

45.3 KB Created: 2020-10-27 16:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4c93518e8b717a1803d20ff661752589 SHA-1: 276dc3062fccb31c98c7b362a5e1f8b51208f917 SHA-256: 1047efd977f80812a728785d1d147dd742f9d026ee952cb81d0b92e9dfb4cd84
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=immuderm+skin+care'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body indicates an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

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://cctraff.ru/strik?keyword=immuderm+skin+care In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f8a8da37052e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f8e0befce54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f8fee51af1f3.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/1cdde797-279e-4a4c-bdd1-772eb3b6be48/sobimovejisapagixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfa70c6-26e2-498e-8a19-2c4849cfd1aa/55597031908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6adbfbc-7687-42f4-a403-e28c050753c6/volewafowoworinoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51ce166-9186-4368-84e9-1344181f2d50/femefovela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548d85a4-8da8-45b5-83a3-f5d0f8bf3893/26466267820.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7305/1042/files/textnow_premium_apk_old_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2762/7676/files/dragon_nest_m_apk_sea.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9565/4564/files/indian_art_history_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3294/9148/files/pdf_to_html_converter_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2754/1409/files/causes_of_uterine_fibroids.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/veterinary_microbiology.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/84553544410.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/cassation_decision_volume_16.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/12th_class_biology_book_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/problemas_sociales_en_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/62111233554.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_off0000707a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707A 5052 bytes
SHA-256: 91255f2c2140aa22be41c51b386a75685b5c84251ce2069c6edcd41537194cb1
font_01_sfnt_off00008184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8184 11340 bytes
SHA-256: b3e0cd79fe4d1e52601696a9e567227eb72d5132d72ed768d020a063bf3d8aca

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