Malicious PDF — malware analysis report

Static analysis result for SHA-256 28333830709e98ea…

MALICIOUS

PDF

66.8 KB Created: 2020-08-26 08:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a2d3318ae4846237a1e1dfa029ac1fb SHA-1: e8a69f5276442b9276d9c04c16af08199bffdde9 SHA-256: 28333830709e98ead6f987fe41e7a06e5665396dc27ede02fec7f2fb029e7f14
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=d2+point+group'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but likely used to mask the malicious redirect. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or heavily obfuscated, but the presence of the malicious URL is the primary indicator of compromise.

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=d2+point+group
    • http://borumap.viana-motion.com/uploads/1/3/2/6/132683138/livupurikub.pdf
    • http://dubasu.jahc2018.org/uploads/1/3/1/4/131408061/sivemamina.pdf
    • https://cdn.shopify.com/s/files/1/0433/4518/2888/files/zero_conditional_esl_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/apa_format_citation_article_in_journal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/gozowuxiroj.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/31289920839.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/pekatasotovobesekiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/evidence_chain_of_custody.pdf
    • https://cdn.shopify.com/s/files/1/0432/5077/8269/files/95482326641.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/23547459424.pdf
    • https://cdn.shopify.com/s/files/1/0449/0015/5559/files/grammar_english_basic.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_off0000a183.bin
450320721fc47d46c8e9cdbd34eca883355e9a3aca0d108c65925d050285cd2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA183 4700 bytes
font_01_sfnt_off0000b198.bin
132badb897a4017b4c05f3cd45a26e6920311e44692a3ad5225257cc6a2305f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 16872 bytes
font_02_sfnt_off0000e665.bin
6d1904016a904e0046e5c26e184076e1a377943b7c97c99b15d16ebfd5b1e13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 16336 bytes

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