Malicious PDF — malware analysis report

Static analysis result for SHA-256 a739d5a145c989ca…

MALICIOUS

PDF

45.9 KB Created: 2020-08-24 20:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0388c268eed6c27d91a6e5c9692b9248 SHA-1: 1f6d38edb856dc97247d7d1d43fa98531aa300a9 SHA-256: a739d5a145c989cac6c0dc365993bbf8bb7d41d1147da859fcbf5436f92a2339
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify-hosted PDFs, likely as part of an SEO link farm. One critical heuristic indicates a direct link to a known malicious redirector, ttraff.cc. The document body contains the malicious URL and a reference to surf reports, suggesting a lure to entice clicks. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=seminyak+bali+surf+report
    • http://files.buckscountywomenschorus.com/uploads/1/3/0/8/130814466/josivugemetos-natisuvajo-pasekonem.pdf
    • http://files.irenesdreambox.com/uploads/1/3/0/9/130970012/5330657.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/rivajedabawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/xuxitelagigikarofulesip.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/37526215944.pdf
    • https://cdn.shopify.com/s/files/1/0429/0209/3987/files/v_k_letter_whatsapp_status_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7347/files/math_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4338/files/migokabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/45745705240.pdf
    • https://cdn.shopify.com/s/files/1/0458/1408/7846/files/f2p_dungeoneering_guide_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/80034002802.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/advanced_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/ubiquiti_ap_ac_lite_manual.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_off000075f8.bin
f29096c37e486de62151e4d16fe7e686ea412dd2d2d10fb584a20ebc665ca5e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F8 5456 bytes
font_01_sfnt_off00008878.bin
e82f6b700b10e8d6b36fdfb795ad666189fda0bb458af0f803bd7637e92d2160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8878 10120 bytes

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