Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c25a17f0b4b065…

MALICIOUS

PDF

39.6 KB Created: 2020-08-09 20:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82301a2bd19c2073eff8618d5d9e1a51 SHA-1: 81ca401e5c7fde5d3dad9e4f2ab3df715af70b66 SHA-256: 23c25a17f0b4b065bf47cef50bca49bfbee0761083531bf3be166c6bb5ac4610
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One of the primary links, 'https://ttraff.ru/pify?keyword=inter+1st+year+text+books+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for educational materials, suggesting a phishing or scam attempt.

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=inter+1st+year+text+books+pdf
    • http://lusukanoj.adambaybutt.com/uploads/1/3/1/6/131637257/7c0d0434.pdf
    • http://files.chrislilly.tv/uploads/1/3/0/7/130776728/nufopufiso.pdf
    • http://files.southbridgeboathouse.com/uploads/1/3/2/8/132814468/tivovile-povafipu-pitofikifel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/bavugepojope.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4657/files/apa_writing_style_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/48288248214.pdf
    • https://cdn.shopify.com/s/files/1/0434/2274/4741/files/34254617931.pdf
    • https://cdn.shopify.com/s/files/1/0435/7806/5059/files/que_es_una_cadena_alimenticia.pdf
    • https://cdn.shopify.com/s/files/1/0436/6653/8649/files/85417794428.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0198/files/18725293391.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6553/files/big_data_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/mazanedemoluvolereni.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_off00005dee.bin
4f0c54c98530e653c6fbd9043b3f3b3e3715147c6b1b4ebf750dc92e99fc41db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEE 5364 bytes
font_01_sfnt_off0000704c.bin
69594c9b932d67ea342a6924c8a754e3c1256f557ad4ad3266cd59e888dcc34c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704C 9864 bytes

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