Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de10543198be45b…

MALICIOUS

PDF

35.5 KB Created: 2020-08-16 15:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b28366d4ab8b5f818c67d29567b5ba1 SHA-1: e194a14a1f29cbfdbdb732fecdaa5c7c738c61f3 SHA-256: 8de10543198be45bcf30b36d7531f8c8df7458a6cb1143d483e3720115764b5d
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which are linked to external PDF files hosted on various domains. This pattern is indicative of an SEO link farm, likely intended to boost search engine rankings for malicious or spam content. One of the embedded URLs, 'https://ttraff.com/pify?keyword=cranial+bones+labeling+worksheet', is flagged as a malicious redirector.

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.com/pify?keyword=cranial+bones+labeling+worksheet
    • http://files.linlinkyawhtet.com/uploads/1/3/0/7/130776489/7908300.pdf
    • http://teroroza.wellbalancedfolsom.com/uploads/1/3/2/8/132814930/20337.pdf
    • http://mabajetig.caribbeanmemoryproject.com/uploads/1/3/1/4/131453433/wafizarajukaru.pdf
    • http://files.tomnoblehomes.com/uploads/1/3/1/3/131398134/gutuj_falonumulinumig_sidiwo.pdf
    • http://files.ephratamartialarts.com/uploads/1/3/1/4/131438464/8124226.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/cbse_affiliation_bye_laws_2020_17.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/basic_of_java_language.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/67454288688.pdf
    • https://cdn.shopify.com/s/files/1/0429/1310/4028/files/fincen_suspicious_activity_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/4601/8967/files/tripadvisor_chiang_mai_tour_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/bevepoxaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5721/5648/files/31809840937.pdf
    • https://cdn.shopify.com/s/files/1/0451/5692/5594/files/79877078511.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/waputoserogulomomedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/34625709820.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_off00004c77.bin
ae89a009c5f02aec52ce0db9f6f9f49a7105b2e86247385b926bc24e3fb0e6ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C77 5148 bytes
font_01_sfnt_off00005dfe.bin
bb164f776acacaaf2bdb6f86d97e533b19fc6db121a6e8bcca4f4ef0dd2c9c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFE 10284 bytes

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