Malicious PDF — malware analysis report

Static analysis result for SHA-256 40da6f9fb04dbfdb…

MALICIOUS

PDF

40.5 KB Created: 2020-09-02 12:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7aa8d4943a71f2dd0c62a49d2cbf24a5 SHA-1: ff847f92e54d7701f4b8a185ee98c4bf6c78d50e SHA-256: 40da6f9fb04dbfdb0ae11c5237918bb70c26ee2f9bb30155a907075eabd65535
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic identifying a malicious redirector. The document body, though partially corrupted, contains text related to 'legal aptitude test questions and answers pdf' and a URL that matches the malicious redirector. This suggests a phishing or malware delivery attempt, where the user is enticed to click the link under the guise of accessing test materials, leading them to a malicious site.

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/wix?keyword=legal+aptitude+test+questions+and+answers+pdf
    • https://static.usrfiles.com/ugd/824332_50b7ceb3ee0e488ea2ee2f9494e6d566.pdf
    • https://static.usrfiles.com/ugd/4d400c_bcb52604ead9406a85e83192ab7a3472.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a9b832ce99c473fb8a95568f8a7f68f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a52dcec19ad449e08cce8e75e85e1561.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorirazapevimixawas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/jolilures.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/conduct_disorder_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/cad_block_free_flowers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/towetobipixux.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/romejidajeno.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/63140152252.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/95130332369.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/56923708359.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_off00005fcb.bin
01f3f9b960472a62feee0e4bca7aafa0325e58ea65d4e2afed131263eda3091e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCB 5368 bytes
font_01_sfnt_off0000722e.bin
b1e9ae2039ddd80f03d69c94503cea947cb8af4c7e692a85733a2689b66f600a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722E 10616 bytes

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