Malicious PDF — malware analysis report

Static analysis result for SHA-256 7296c77a78bd25bf…

MALICIOUS

PDF

41.1 KB Created: 2020-10-02 03:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c2c200cde2813c9a65647627d727232 SHA-1: e9306353ba71d2fb4cc6a4983e42da482c6117d3 SHA-256: 7296c77a78bd25bf9f3223f23ec8b76544217ad2295cbe823f335599e444ef54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The primary malicious URL identified is 'https://gettraff.ru/strik?keyword=the+scarlet+letter+study+guide+chapters+16-24+answers'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a link farm or SEO poisoning attack.

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://gettraff.ru/strik?keyword=the+scarlet+letter+study+guide+chapters+16-24+answers In PDF document text
    • http://pupatokuw.dearborncountyhs.org/uploads/1/3/0/7/130776330/7836475.pdfIn PDF document text
    • http://xopituze.jessicawelshpiano.com/uploads/1/3/0/7/130775584/9797977.pdfIn 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/1/0434/1805/8901/files/xavoxoripetanedewedifud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7350/8006/files/providence_colby_campus_imaging.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/popping_dance_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0104/0024/files/creedence_clearwater_revival_pendulum_vinyl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/mediacom_channel_guide_east_dubuque.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/4652/0220/files/75107269808.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2825/8726/files/39275056140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7026/1925/files/96621410582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1927/9263/files/tijibexerumozuzafizewum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3241/0272/files/plastic_texture_pack_minecraft_bedrock.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/php_notice_array_to_string_conversion.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_off00006175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6175 5936 bytes
SHA-256: f0cb7f2c87fcc03846a8846af0e844d72354f088f99d29ddbb3059ed3bcd0eef
font_01_sfnt_off000075cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75CC 9816 bytes
SHA-256: 15cd371681f78838c66925b42d16d8b57afe30fabae0f3fec06a87f4bc5c97ad

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