Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3c0815d0bf487e…

MALICIOUS

PDF

42.0 KB Created: 2020-08-08 15:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d780832ae0b066810c17f33b455f904f SHA-1: d0c0fe2f7bab1c767f20908394d4cd080222721d SHA-256: 1b3c0815d0bf487e6977d4785450c0bf11316fe3ea1ae88c8c4f7c70f1a28db6
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to HIV/AIDS facts and the URL itself, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for the malicious redirector. The file was generated by wkhtmltopdf, a tool often abused for creating malicious documents.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/pify?keyword=hiv+and+aids+facts+pdf
    • http://fizuzu.csangha.org/uploads/1/3/2/7/132740541/milojipazelowuwinij.pdf
    • http://files.clothdiaperdepotusa.com/uploads/1/3/0/9/130968934/tibapizazuja-goges-livasef.pdf
    • http://files.rousselartconservation.com/uploads/1/3/0/7/130775848/52a9280113.pdf
    • http://files.doorado.net/uploads/1/3/2/6/132681823/vulaworuru.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/quality_assurance_officer_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/95227401388.pdf
    • https://cdn.shopify.com/s/files/1/0431/0492/7905/files/xotavik.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/allegorie_de_la_caverne_de_platon.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3970/files/56056117401.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/up_assistant_teacher_exam_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/8824025823.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/automatisme_informatique_industrielle.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/tecnologias_de_la_informacion_y_comunicacion_unam.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/pliny_the_elder_clone.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006681.bin
9c26c41d6ab3b460aa9d7f6f3e5cd3d5fe9d121d41c972fb850003510321f1e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6681 5040 bytes
font_01_sfnt_off000077ca.bin
bdb249fd75da7795ae5ef0167b4bc4dede945c1908082bbba62724a72c5b900d
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CA 10536 bytes