Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ae231ae921df1e…

MALICIOUS

PDF

78.4 KB Created: 2020-08-25 15:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6997e7cb5f26411e56ceaa2dea4da77c SHA-1: 44db9b171a773855292d2e0188865b58f9f16284 SHA-256: 81ae231ae921df1e5ee68fb0f8837d9c0fda8ba499f6ae2dc2a6337bcb1a7877
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One of the primary links, 'https://ttraff.ru/pify?keyword=bhojpuri+video+film++2018', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for users interested in 'Bhojpuri video film 2018'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector.

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=bhojpuri+video+film++2018
    • http://wixivudaf.wileyreads.com/uploads/1/3/0/7/130775643/dubafi.pdf
    • http://files.cookwithjames.com/uploads/1/3/0/7/130739340/8638391.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/gosefubuzamoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/duduke.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/43871114136.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/barriers_to_social_change.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/2856873937.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/93241118125.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6063/files/cellulose_acetate_membrane.pdf
    • https://cdn.shopify.com/s/files/1/0431/6010/9210/files/tunajujokesewuxire.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_off0000e6e4.bin
10006d7b9e83906ff20996c0235004c1afc8ebb02438afcaaa6629ae0aeb8d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 5296 bytes
font_01_sfnt_off0000f8f8.bin
f39cc16eded3cc9e35a5706359a49a92881a9efa5f7ab32dcf5a5c11efedf4c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 11544 bytes
font_02_sfnt_off00011ecd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 4324 bytes

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