Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec673876f8c2ba7…

MALICIOUS

PDF

33.0 KB Created: 2020-08-13 02:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae61acdbcf9d0d132fc10c3b570e678f SHA-1: 2f8ad98db26dd3a4c6d128a0d475739260df0b2f SHA-256: 8ec673876f8c2ba73769737fa4e9662106b4f6ec2b18262170741dd760cb24d0
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=medical+terminology+for+health+professions+7th+edition+pdf'. The document body, though heavily obfuscated, appears to contain text related to medical terminology and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=medical+terminology+for+health+professions+7th+edition+pdf
    • http://vuzagi.augustasquarecondos.com/uploads/1/3/0/7/130776795/2513709.pdf
    • http://files.brillomedia.com/uploads/1/3/0/9/130969421/sudom_getixu_zifawuxemi_buvetokubivage.pdf
    • http://kemibik.topophotography.com/uploads/1/3/2/6/132680903/tesidam.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/wawodef.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8707/files/free_comic_book_files.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/43603242043.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2614/files/logistics_operations_supply_chain_management_and_sustainability.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/anatomy_of_whole_body.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/adductor_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/76911161633.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/duzaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/pisununirav.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4283/files/ups_store_valdosta_ga.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_off000043a3.bin
f05843fcad7666fe4372f88c20ce7907404a8a95355c23930e219705f0b50a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43A3 5756 bytes
font_01_sfnt_off00005724.bin
37ef56617a1de455d1bb0d197cef68c49e4d7cd44177184ac40e4bf7f3684e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5724 9320 bytes

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