Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3999da0f9341d4…

MALICIOUS

PDF

43.7 KB Created: 2020-08-17 06:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e7fdf8b1de36d859ea692c48ccd53a1 SHA-1: 568c4f3eb00eb6e22dc69cc9471b16d43180f92a SHA-256: ca3999da0f9341d47b8e029f8cb4572e537d00ce56650c95523ec2c93ec71738
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=rural+development+class+11+questions+and+answers
    • http://mudokani.aexist.nl/uploads/1/3/0/8/130873995/88a0d9c1c7.pdf
    • http://files.dolphinrealtyhatteras.com/uploads/1/3/1/3/131398140/9293780.pdf
    • http://retiwew.cydneyuffindellphillips.com/uploads/1/3/0/7/130776542/3610950.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/60416713106.pdf
    • https://cdn.shopify.com/s/files/1/0431/7210/2301/files/toefl_test_preparation_kit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3882/files/37584745316.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/jurefivowi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6260/6489/files/72701341562.pdf
    • https://cdn.shopify.com/s/files/1/0438/2097/4242/files/7607699697.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90379225571.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/cataract_journal.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_off00006bae.bin
5b7807758843f11b1ebb1c499989c111220111d96452773fcc57745cb4006488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAE 5556 bytes
font_01_sfnt_off00007e9d.bin
964c7216fba612400cfb928b7778e265f1ca646cd43ab063b8f4e0b67663acd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9D 10436 bytes

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