Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd65fb69686fa9e9…

MALICIOUS

PDF

51.4 KB Created: 2020-08-10 02:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 631df2c4481d0636baee98a438d899b0 SHA-1: 9337bbd951e871ca21fcb2dc017013829e9e9c75 SHA-256: dd65fb69686fa9e919e5d03458e00f0d91f6fc073db74bc07f79a0fd1e0475cd
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, characteristic of a link farm designed to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=shed+plans+10x12+free+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous Shopify-hosted PDF links further supports the link farm hypothesis.

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=shed+plans+10x12+free+pdf
    • http://files.emeraldcoastchapter.org/uploads/1/3/1/4/131437017/wanizulusixepav.pdf
    • http://files.freemanschwabe.com/uploads/1/3/2/6/132681658/watiniroxipi.pdf
    • http://files.compassionstaffing.org/uploads/1/3/2/6/132681476/bonodijadegine.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/ronawenexoker.pdf
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/ronuzitadidalubunuzatizuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2684/0738/files/wokuwajuzut.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/zogumixogeludemowigored.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/reduce_size_macos.pdf
    • https://cdn.shopify.com/s/files/1/0438/9113/0536/files/gastroenteritis_akut_idai.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/47921237267.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1453/files/dota_console_commands.pdf
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/construction_company_profile_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/dimigosuwetuxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1775/5034/files/risk_hedging.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_off00008ba7.bin
5a439a8d7621b65697b816e4b6e0ff88dc5c64994c0f8d4fd5c00d6ddd1e3b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA7 5628 bytes
font_01_sfnt_off00009ecf.bin
11e9c2e0652fb9ec1cf0875b9e9d5ecef65a3ab24fa305000140f73445a66c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECF 9964 bytes

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