Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a93bff934be1f6…

MALICIOUS

PDF

45.4 KB Created: 2020-08-16 22:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 966c5d7577baecbcfc68dd8c19d3f246 SHA-1: 775b6a4973252c2f344e9aee83da357537685e55 SHA-256: 19a93bff934be1f65260b4bd9f16da7a85b235e2254a16b09ed3b2f2ca75e33b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to external PDF files hosted on Shopify and other domains. One prominent link, 'https://ttraff.ru/pify?keyword=double+contrast+barium+enema+pdf', is identified as a malicious redirector. The document's structure and the presence of these links suggest an attempt to direct users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample.

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=double+contrast+barium+enema+pdf
    • http://komatonav.plantfairs.com/uploads/1/3/2/6/132683051/a3dd9b2c.pdf
    • http://jepudin.nteu173.org/uploads/1/3/2/6/132681144/2720382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/maposakune.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3383/files/58266620518.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/13731415885.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/las_amistades_particulares_libro.pdf
    • https://cdn.shopify.com/s/files/1/0429/7274/1791/files/79170780463.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/abordagens_metodolgicas_do_ensino_da_educao_fsica_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1633/9111/files/callan_method_book_3.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/intraclass_correlation_coefficient_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/85526812982.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/babape.pdf
    • https://cdn.shopify.com/s/files/1/0436/0706/4734/files/grammar_based_models_in_computer_graphics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632d.bin
98e42ba4a11fe719f4c8caf934a57844335ea8e4a6d396c151d7c8a7abb0beda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632D 5320 bytes
font_01_sfnt_off00007521.bin
80d8d4bc9506dda301bb3105b3bb5e9be322cb30b9649559dc28dffdc82c24e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 11372 bytes
font_02_sfnt_off00009ad5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD5 4324 bytes

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