Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d99717b946e291…

MALICIOUS

PDF

45.0 KB Created: 2020-08-02 05:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ecfca6974e93dc199df5e7b441ecf85 SHA-1: 579caadaa8412f4061c75405f72c74301a360402 SHA-256: c8d99717b946e29155821548943d2be8df0ca548ee2c4c63be0f05b945eaaf1b
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple URLs pointing to Shopify-hosted PDFs. One critical heuristic indicates a malicious redirector link to 'ttraff.ru', which is likely the primary malicious destination. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm structure strongly suggest a phishing or SEO poisoning attack.

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=robinair+34288+problems
    • http://files.wakelandcolorguard.org/uploads/1/3/1/4/131437029/gikuz.pdf
    • http://files.downrivermortgageone.com/uploads/1/3/0/7/130739697/3acc0769f521.pdf
    • http://files.ebpnj.com/uploads/1/3/1/6/131606169/4131062.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/38532693062.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/nezawuxitag.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/648189685.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/rovivowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/42302206004.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7424/files/robin_hood_api.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/lutotixitanifo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/denejezizawefepasirivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/zesowotekaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/damojezijenepibogu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5841/2185/files/autohotkey_caps_lock.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7607/files/gazopeziranonugupidu.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_off00004e46.bin
0b6dd70329e887b86b7ba3e8d8082eb0fd332173e1b25514b5f922ea06a52196
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E46 5688 bytes
font_01_sfnt_off00006194.bin
412ad94f79c57f10be73f083b1acd75cad7316f0c4a6d15c8f54f57e5cf0c48e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 14932 bytes
font_02_sfnt_off00009003.bin
88439519992b54a76c49e1773b2988ac0eb869403dfb9e9ab63ea25f7580dedb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9003 16120 bytes