Malicious PDF — malware analysis report

Static analysis result for SHA-256 f309f7fdcb1da7ce…

MALICIOUS

PDF

58.8 KB Created: 2020-08-21 08:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb3c2f7f8146ddb9edab619f0d8048e SHA-1: b97c8984dedd63c90c4e828154c2be76e1d2bd42 SHA-256: f309f7fdcb1da7ce98d378f4484776c0fa1be46e7869b246fddf7e5fe9dcb478
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to a redirector service (ttraff.cc) and a large number of PDFs hosted on Shopify. This indicates a link farm or redirection strategy designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious. 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.cc/pify?keyword=guidelines+neuromuscular+blockade
    • http://files.peggyjoyceruth.org/uploads/1/3/1/8/131871799/d668199f679a.pdf
    • http://files.anschutznorthamerica.com/uploads/1/3/0/7/130775921/tewupiwexaleloz-tanipexomadisup.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/free_vector_beer_label_eps.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/yajur_veda_upakarma_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/viverulonarupuletor.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/ofsted_report_cockburn_high_school_leeds.pdf
    • https://cdn.shopify.com/s/files/1/0447/3618/4474/files/gepuniz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/sexebewuguz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/picadura_de_araa_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/jemitipepoberijugowijoxof.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/puzifafuwo.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_off0000a727.bin
21237fa319dd5347120c94dc1b96027ed86314967560c153ffbaa4b78fdb13f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA727 5320 bytes
font_01_sfnt_off0000b917.bin
131627f04f3eb695699b2b1852be9f87007751eb58f3f6df358920668cca6878		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB917 11436 bytes

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