Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d32da148a5bbae…

MALICIOUS

PDF

57.0 KB Created: 2020-08-31 10:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19003ab5b943f8e10e5a18a4fe4f4cb2 SHA-1: f4c1bd26d28fd0b64071091c83304359d66353ad SHA-256: 11d32da148a5bbae25e84fa6920ce20a2a240bf6bcb95e962dd7d886015032e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is presented alongside a seemingly innocuous document title and a large number of embedded links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=super+mario+with+yoshi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/9412105059.pdf
    • https://cdn.shopify.com/s/files/1/0438/0380/3808/files/global_information_technology_report_2009.pdf
    • https://cdn.shopify.com/s/files/1/0430/9742/4026/files/katumetabeleb.pdf
    • https://cdn.shopify.com/s/files/1/0434/2274/4741/files/15145654291.pdf
    • https://cdn.shopify.com/s/files/1/0428/6749/0972/files/basic_computer_networking_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/37786190333.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/kokupovixisur.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/florida_pharmacy_law_review.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/85943810141.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/72128915909.pdf
    • https://cdn.shopify.com/s/files/1/0460/3284/7012/files/taregiwem.pdf
    • https://cdn.shopify.com/s/files/1/0433/9476/0862/files/definitions_in_c_language.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/mark_sheet_in_excel_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7256/6936/files/cet_2019_application_form_last_date.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mizamolapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8640/4000/files/sickle_cell_anemia_download.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_off000089f9.bin
dfe5d7973c117fd0846436cd4da14d21ba46ea73af91727e6891490a9b32193b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F9 5952 bytes
font_01_sfnt_off00009e90.bin
5e90ae4b8117175c744744b3ee7763ffcdbaac31f4408829bd5adcadfd40538c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E90 5324 bytes
font_02_sfnt_off0000b099.bin
fc063de91dc2d9dca80be73859a65216dfa19c4df9ad943969b5c3e0d22e36a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB099 11088 bytes

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