Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e7dfe5c0dff738…

MALICIOUS

PDF

41.8 KB Created: 2020-08-24 06:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cda28bc73f5e314a9108cf9246b3d51 SHA-1: 672049f1b1d1b77e5c1f64b25b6c53fb92293adf SHA-256: 51e7dfe5c0dff738acf1ed50d136a63feffd9cd28d1ada6d3c792979dfa9f73f
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/pify?keyword=receita+de+chimango+de+forma+simples', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify URLs, suggesting a coordinated effort to lure users to malicious destinations. The primary attack pattern involves leveraging these links to redirect users to potentially harmful content.

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=receita+de+chimango+de+forma+simples
    • http://varebe.thecommonwealproject.com/uploads/1/3/2/6/132681579/bamarijopuki.pdf
    • http://files.fantasyweddingdecor.com/uploads/1/3/1/4/131411281/duvefuzotofomo.pdf
    • http://files.janeandjohnqpublic.com/uploads/1/3/2/3/132302732/1877916.pdf
    • http://muvepof.cpliofindiana.org/uploads/1/3/0/9/130969873/7196404abcb.pdf
    • https://cdn.shopify.com/s/files/1/0434/4931/9577/files/singular_and_plural_form_of_nouns_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7684/files/japanese_anime_movies_2019_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/bldc_motor_driver.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/rudadebeminamebu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4441/2309/files/desuwulenol.pdf
    • https://cdn.shopify.com/s/files/1/0441/0051/8040/files/45698233445.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/vcenter_server_appliance_update_failed.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/signs_and_symptoms_of_diabetic_retinopathy.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/mofomagusitisom.pdf
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/5835738059.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/sogutanowa.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_off00006168.bin
36ca7fa179c904ebabe4e414b0d4f7c3be925e80e78fd634905ab0f06aed93da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6168 5576 bytes
font_01_sfnt_off0000743a.bin
23803ded9f6a82dee15e8e6f1662028999c67bc65fe3e6eef97e8edb5db6910b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743A 12512 bytes

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