Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e6be19623d806b…

MALICIOUS

PDF

42.7 KB Created: 2020-08-18 23:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6e680d3c60002654d93ec9ef69bbccd SHA-1: 0109f6f014cf5b04b1f01fe620d85746f57ffb42 SHA-256: 04e6be19623d806b8f8ffb7112405eb8aead170d37aa8eb76d23d0f43ebe115f
154 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify?keyword=bullworker+chart+free. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and several other PDF links, suggesting an attempt to disguise malicious activity as a legitimate document or to drive traffic to various sites. 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=bullworker+chart+free
    • http://files.northeastherbal.org/uploads/1/3/0/7/130776164/palosupusow_falenubukagufaw.pdf
    • http://files.siouxcenterscouts.org/uploads/1/3/0/8/130814288/ginugoduxuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/61704657623.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/vafimanibinobugapeko.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3902/files/toastmasters_advance_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28664871254.pdf
    • https://cdn.shopify.com/s/files/1/0437/5828/9045/files/alberto_moravia_horalka.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/9782632625.pdf
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/35162601881.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/sony_android_tv_apple_tv_app.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3873/files/philips_respironics_dreamstation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1014/files/guidelines_caesarean_section_maternal_request.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/best_rooting_app_for_android_7.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/wotafedimasulugutibavedul.pdf
    • https://cdn.shopify.com/s/files/1/0438/9856/8859/files/15141858370.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_off00005fed.bin
ecf0700909d5d409e43492ef8a10218cba545508c63010d87e38b29b8c3c0190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FED 4996 bytes
font_01_sfnt_off000070fc.bin
5089db19a751fc46404550278aefe23bf4156c9cd8452909e7e8f816910ff047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FC 14716 bytes

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