Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4d28810aa9ab88…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 01:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc9c739e24d9f51aaa0c28972fb52335 SHA-1: 6cb28ed98b814b1ca6c7606a7dfdc5cfc19eeb6f SHA-256: 6c4d28810aa9ab8897f55e8f23563c7fe0c20f71c7bd9454e51faf20c294614c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=small+business+income+and+expense+worksheet', which is flagged as malicious. The document body, though heavily obfuscated, contains references to financial worksheets and the malicious URL, suggesting a lure to a phishing or scam page.

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.ru/pify?keyword=small+business+income+and+expense+worksheet In PDF document text
    • http://xuwag.cornerstoneuk.org/uploads/1/3/2/6/132681579/1354640.pdfIn PDF document text
    • http://levus.charmvilla.com/uploads/1/3/0/7/130738799/e925c192dec18.pdfIn PDF document text
    • http://geruf.vanfiretrust.org/uploads/1/3/0/8/130815017/fogoxetewunel_jatoteg_xokilipuzi.pdfIn PDF document text
    • http://files.intothewildinc.org/uploads/1/3/0/7/130738919/rumubarove_fukositokelomod_xasiluzepafag.pdfIn PDF document text
    • http://files.mustardfitness.com/uploads/1/3/0/9/130969498/dopuno_lulubasodili_doxosepe.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/1/0436/3950/5056/files/95713926811.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7378/8321/files/suneladepipamevitidag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/wamudoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0515/5224/files/21939563099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/69690165002.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/lokefafus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/ranolojuxuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/zunofofaxore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/protein_structure_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7853/3791/files/the_bucket_list_1000_adventures_big_small.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_off00006d80.bin
d89f2ca3824c01485e41d1bdb4f5444848c24c147982432a4d276e4b20aab742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D80 5780 bytes
font_01_sfnt_off00008103.bin
6f60900bf963d1047d5ea11fa5fe61b5606b2542007d27184386a713deb1a08d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8103 10456 bytes

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