Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae7e4b81b50f945…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 09:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ea9ff419cdf5b2ffc80913aa1332a7 SHA-1: 7172b0db598e7b839c756eb5bb144315f212fc2f SHA-256: 5ae7e4b81b50f9453e5f81eaf50fb61f9d48e5e97b9d8e84a08a3d3e94aa73ff
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to known malicious redirector infrastructure or unknown domains. The document body, though partially corrupted, contains text related to 'economics class 9th ncert pdf' and includes the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier strongly flagged this PDF as malicious.

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://ttraff.cc/wb?keyword=economics%20class%209th%20ncert%20pdf
    • http://zanipij.erotickookiekove.com/uploads/1/3/1/3/131398455/gafobedozemagob.pdf
    • http://files.enlightenthejourney.com/uploads/1/3/2/7/132712093/xidafevebij-tanupomagurug-tedakelabawibe.pdf
    • http://files.mountainbodyworkers.org/uploads/1/3/0/8/130874012/3254441.pdf
    • http://files.sttimothyswv.org/uploads/1/3/0/8/130813511/judijexadabemof.pdf
    • http://xovobaf.camping-hire-and-sales.com/uploads/1/3/1/4/131407440/6754609.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/o_ativista_quantico_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/volcano_plot_r.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4315/files/tedapajovedudajokel.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/98710053080.pdf
    • https://cdn.shopify.com/s/files/1/0443/1475/5228/files/aptitude_test_for_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/6497/4742/files/sukadufumolenipegatag.pdf
    • https://cdn.shopify.com/s/files/1/0439/1872/1192/files/philippine_accounting_standards_complete_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/kapopizoserovekop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/translate_algebraic_expressions_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/1742439043.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/essential_words_for_the_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/teas_study_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006338.bin
a0fec20924568fa54015f349e4298b284a8040c8a8a8eb009f1ec9b63683c55b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 5508 bytes
font_01_sfnt_off000075b2.bin
a9e870d16119a15fc0e7c1614b1b1ecf70cf2a822206ecf30b0250de13fa98f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B2 9876 bytes

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