Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3fc2ecb6e5e5ca…

MALICIOUS

PDF

45.3 KB Created: 2020-09-07 13:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 537c3a11c43e57b56e2ca7c16ffd61f7 SHA-1: cecee8bc2303ddc23e2b2bd7c8a5148daaea27f2 SHA-256: 7d3fc2ecb6e5e5cafe05b33324c601da6c56375fd6a0fcdc099795e15c68c80a
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body text and heuristic firings indicate a lure related to invoices or payment templates, suggesting the intent is to trick the user into clicking the malicious link. No scripts were extracted, but the presence of multiple embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.me/wix?keyword=word+invoice+template+for+mac
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4713/2063/files/asynchronous_generator_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/57903942670.pdf
    • https://cdn.shopify.com/s/files/1/0447/0145/0396/files/medical_tourism_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/fugaxuxogesup.pdf
    • https://cdn.shopify.com/s/files/1/0439/5512/6430/files/brucella_spp.pdf
    • https://cdn.shopify.com/s/files/1/0440/8311/8232/files/blood_and_wine_romance_options.pdf
    • https://cdn.shopify.com/s/files/1/0439/0099/3691/files/muxapotisavu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/vosamiwuzuga.pdf
    • https://cdn.shopify.com/s/files/1/0441/0929/9864/files/dieta_para_hernia_hiatal.pdf
    • https://cdn.shopify.com/s/files/1/0437/6018/9594/files/75132054401.pdf
    • https://cdn.shopify.com/s/files/1/0432/2014/0191/files/sonetogegaxataraxim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/4357130520.pdf
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/completion_report_of_building_construction.pdf
    • https://cdn.shopify.com/s/files/1/0437/8122/6657/files/ruxaximun.pdf
    • https://cdn.shopify.com/s/files/1/0431/4690/3701/files/dominos_australia_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/wizugaxulakifegukofekulit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tukesameb.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_off000073f6.bin
4bae268e9297a761fe6d5145b381b929f8a00f0f0cf34b0c6d4d25300c863c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 5196 bytes
font_01_sfnt_off000085a1.bin
71d87ea1619ad0bb2630fb7778b60118a5d3ecf16c6d529b76c1fd75c780d9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A1 10128 bytes

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