Malicious PDF — malware analysis report

Static analysis result for SHA-256 539bfa4244929a2f…

MALICIOUS

PDF

37.4 KB Created: 2020-10-27 13:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e243efc75b2a7b77fa62f3a9b91470b SHA-1: a3a9a9e87c66851b457b948f704b90516b922efc SHA-256: 539bfa4244929a2fadd028739f8f8ee21f1aaf3f1a67d97493d3ab197c82dfe9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially corrupted, includes the URL and a title suggesting it's a lure for SEO manipulation or phishing. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL is a high-confidence indicator of malicious intent.

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/123?keyword=sum-product+networks+the+next+generation+of+deep+models In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4797/1735/files/jaregomumakizeripapafoze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8921/0781/files/car_wash_foamer_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/fepotuxalivogudan.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/tabopijudixatig.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/maths_textbook_for_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/88817010580.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/tcs_medical_certificate_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/momugusaferu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/finding_arc_length_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4415/4791/files/rolusamew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9744/7831/files/fresh_and_valid_fullz_and_credit_cards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3385/6664/files/17716146101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8190/1253/files/presidential_election_process_poster.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6786/6265/files/lanoguru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9087/4020/files/y_nos_tomamos_un_cafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9830457e-1700-4b7e-8206-34276c453d32/84613807135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446d29e4-7c28-4a51-8f67-6d5017f5ab80/gejunevazuzitajozojejim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b8e5f7-acb0-4032-8719-febbefb585c0/58444492805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1cae0b-dfc2-4c0c-b006-2b9bee4f62f5/ejercicios_van_resueltos_selectividad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d6cb30-9ba9-4ab6-ba42-1404c8adcb0b/mirajopukabevojivabagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107d53ec-39d1-44e5-818e-2e1730d03570/26413792359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9572bdcc-7c37-4140-9bc0-d6a879aa875a/9827033657.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_off00005215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5215 5928 bytes
SHA-256: f16ee5251309c11c46eab80d7991982409b9a785087aeb525c8102a8ebfce6e2
font_01_sfnt_off0000662c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x662C 9716 bytes
SHA-256: 1e274302f5d2b614b4c093d0552ebcd50b02069b7126f92357260776fef15301

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