Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef08c4880508b07…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 01:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4acd4d78945f98349d50e1fbb0b0fd8e SHA-1: 4659baa0c3164aff752e0cf9ece2fd2b4efa6089 SHA-256: 9ef08c4880508b0767de0a4fd3543ae4212a714b12207ffd79c54e0e7ab5de2e
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, many of which point to a link farm designed to obscure the ultimate destination. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=brs+embryology+pdf, which is also flagged as malicious. The primary goal appears to be directing users to malicious infrastructure.

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=brs+embryology+pdf
    • http://mepepetu.bitsandbobsmv.com/uploads/1/3/0/8/130815017/1859700f94.pdf
    • http://files.myshabbychicdesignsbycarla.com/uploads/1/3/0/7/130776607/8839240.pdf
    • http://vomezul.barrettbrownpro.com/uploads/1/3/0/9/130969204/ec9f30f78d23a51.pdf
    • https://cdn.shopify.com/s/files/1/0434/5525/0598/files/56214018312.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/88161178151.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/92717129004.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/nubaxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/vasuvabubonifobuti.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/difuxek.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/96012145402.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/freeman_sheet_mask.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/rovaxekadalup.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/android_emulator_for_linux_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3086/3259/files/fuminijebezol.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7096/files/logic_gate_project_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/videoscribe_tutorial.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_off000064b8.bin
166e89c0c3a53e09a1b753631ab8b2e29e82f89dd9dedc67f7d23dd4a8a4ab64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 5444 bytes
font_01_sfnt_off00007729.bin
4b9072b2a49276cc71bf84852add73c4af150dbd32af8cd5dab86941cf49fd24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7729 10464 bytes

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