Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dee9f337ed081d7…

MALICIOUS

PDF

59.7 KB Created: 2020-08-23 10:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a982b495c8d4befeb08ab08ddb82008b SHA-1: 9c44c9610efcf76013c78fa4664d7524f41639b8 SHA-256: 2dee9f337ed081d7da41e754ca8f3361b3e8309c92de71cb0ec1701b0fba807d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a PDF link farm designed to host numerous external links. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the document structure and link farm suggest a delivery mechanism for malicious content.

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=uterine+leiomyoma+management+guidelines
    • http://govalu.squarecatvinylshop.com/uploads/1/3/0/8/130813453/3835748.pdf
    • http://files.johndecastro.com/uploads/1/3/2/6/132696598/kawewotunoredivuvitu.pdf
    • http://files.ddtotalfitness.ca/uploads/1/3/0/7/130775331/vavaziralifutova.pdf
    • http://zibab.k9blueprint.com/uploads/1/3/0/7/130775626/1184167.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/dodeleniwit.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/muwufijumuvif.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/42727258919.pdf
    • https://cdn.shopify.com/s/files/1/0440/2633/1286/files/unchained_monk_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/45886776684.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/safiboninizurufuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8793/7179/files/vawaxu.pdf
    • https://cdn.shopify.com/s/files/1/0451/6413/4554/files/30259875801.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/taxmann_ca_foundation_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/tutorial_amadeus.pdf
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/free_colouring_worksheets_for_toddlers.pdf
    • https://cdn.shopify.com/s/files/1/0439/1161/0536/files/arithmetic_coding_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/de_2501_part_b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009caa.bin
eb31ec63232d59651f1d8f3a8e501bc95da78519f54cd0a9dbb80030c72c7366
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CAA 5120 bytes
font_01_sfnt_off0000adf7.bin
baa39316f602fe905c8a6ea7f4464f851a9453e334dff5681738584f35b9f55e
pdf-font-stream PDF embedded font (sfnt) at offset 0xADF7 11648 bytes
font_02_sfnt_off0000d381.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 4324 bytes