Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52a7cffacac5c23…

MALICIOUS

PDF

40.8 KB Created: 2020-08-19 23:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d50e8bb2a6b560488f4f9aacb9270fe9 SHA-1: dc57bc2406ac266cba3fd7078f2757cd2e89329f SHA-256: f52a7cffacac5c239dc347360c9c16fb059aed33e2a8c0ab3ae168996ee7fbf5
160 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, specifically pointing to 'ttraff.cc'. This URL is designed to redirect users to other sites, and in this case, it is associated with a keyword related to 'a view from the bridge notes pdf'. The document also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. Another critical heuristic indicates visible command execution instructions, suggesting the potential for LOLBin usage. The primary malicious IOC is the redirector URL, which is likely the initial step in a phishing or malware delivery chain.

Heuristics 4

  • 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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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.cc/pify?keyword=a+view+from+the+bridge+notes+pdf
    • http://bixivo.icycurls.co.uk/uploads/1/3/2/6/132681670/gobafir.pdf
    • http://files.guosa-language-tv.com/uploads/1/3/1/4/131437513/kubipesovinibiboso.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6212/files/95435167193.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sogogetuxupoxex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/html_index_page.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/ridepow.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/chinese_to_english_words.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/bombers_web_series_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0440/0247/6190/files/8191057118.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_off0000616f.bin
99c87b74d3e8551ec017e89685afbf5edec0769ef9b111d34a77c7d6232e500c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 5492 bytes
font_01_sfnt_off00007410.bin
cbcf2306c9863a01f2f6e0f59a787a913be27d608a18a71ceb84394f9b196d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7410 10040 bytes

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