Malicious PDF — malware analysis report

Static analysis result for SHA-256 431937510788fdbe…

MALICIOUS

PDF

39.9 KB Created: 2020-08-17 13:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be86ffd76adaba16912560ad001ed0c SHA-1: d9373ae9d35657befa6a8909301ff275b4be68bc SHA-256: 431937510788fdbebfd4a3891f9ce21d6a0f31455f639dd7c0f1ea8aa9211281
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.003 Windows Command Shell

The PDF contains a visible link to a malicious redirector, ttraff.com, disguised as an educational worksheet. This redirector likely leads to further malicious content or exploits. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates that the document may also contain instructions for executing commands using Windows scripting tools, further supporting a malicious intent.

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.com/pify?keyword=dividing+complex+rational+expressions+worksheet
    • http://rugit.smykkemageren.com/uploads/1/3/2/3/132302942/164d59e538.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/71259572980.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1223/files/command_line_curl_post_request.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/94520970202.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/sosefubitokadibizagume.pdf
    • https://cdn.shopify.com/s/files/1/0432/0398/5570/files/5230466227.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/ritepefigibuvakofuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/13793356435.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/8410689389.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/muzuxik.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/fobupeloxotopalele.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_off00005e28.bin
a9f1a55f0744e874b39cf42a16d30308851dfdb5816f96d439d71acdcb28706e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E28 5772 bytes
font_01_sfnt_off000071bc.bin
ab88686a70d789abbd6fb97d03a93e6e7ae856bc7c29267ecb5fb5cd6b7c0860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BC 9620 bytes

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