Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb8dc11cab0b1c4…

MALICIOUS

PDF

44.0 KB Created: 2020-08-17 07:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 907c9a23f9a823d0b386a38f3506c385 SHA-1: 8e961eb0e87b136284b33df2922673cf21a6fbdf SHA-256: 3fb8dc11cab0b1c43f47e302126e5fca6a3f540a1c1d0de016090e596c9e725c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=beamforming+matlab+simulation', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other PDF links hosted on cdn.shopify.com, suggesting a coordinated effort to drive traffic to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicates the intent to redirect users to harmful sites.

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=beamforming+matlab+simulation
    • http://files.taylorhobsonserviceusa.com/uploads/1/3/1/3/131397996/lenivefipawuv-siwikobeli-dosutatalug-wimos.pdf
    • http://basusu.karenjshaw.com/uploads/1/3/0/9/130969926/800b0906b3962.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/43866409371.pdf
    • https://cdn.shopify.com/s/files/1/0434/5623/3638/files/jijifawabaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/0659/8040/files/exam_ref_az_103_microsoft_azure_administrator_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5300/7526/files/oktava_mk-_319.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/56864720187.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/maxozuribani.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/33888514187.pdf
    • https://cdn.shopify.com/s/files/1/0440/8904/9238/files/85367232876.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/wovulowozofomedizem.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/majuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/android_airplay_receiver_source_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/9894284481.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_off00006a08.bin
160eea1a6838d1a02044238aefd1cc77ec6a653614ffdc8a5eb2a72cf4c86670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 5276 bytes
font_01_sfnt_off00007be4.bin
b0698a45be31a23a5b8b42c20d42d2bd639bc22f079347f566373deef59c372f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE4 12116 bytes

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