Malicious PDF — malware analysis report

Static analysis result for SHA-256 4040921bd389f0b4…

MALICIOUS

PDF

33.9 KB Created: 2020-09-05 18:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b06faed60ce1410e8fe2d47d2e56e34 SHA-1: 9e9407ace14c47391a624aed1b5ab616fd1214d2 SHA-256: 4040921bd389f0b48b5b5e8ba980fa5d7e9865f308952ca2c0fdc32cfe047210
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, many of which point to a redirector service. The document body, though partially corrupted, suggests it is disguised as an educational worksheet. The primary malicious URL, 'https://ttraff.club/wix?keyword=homophones+and+homographs+worksheet+with+answers', is flagged as a malicious redirector, indicating the likely intent to lead the user to a harmful destination. The presence of numerous PDF links, including one to 'vekoxuruzojojig.pdf', further supports the attack pattern of a link farm designed to distribute malware.

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.club/wix?keyword=homophones+and+homographs+worksheet+with+answers
    • https://cdn.shopify.com/s/files/1/0435/3094/4664/files/vekoxuruzojojig.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/polipadaroloxawozani.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/54225791495.pdf
    • https://static.usrfiles.com/ugd/e1c37d_80a6a3bb5ea54985b4eeedcc4b7b7a07.pdf
    • https://static.usrfiles.com/ugd/0a052f_aacd5d861dbf4f0d840b9cf7221bc72e.pdf
    • https://static.usrfiles.com/ugd/12f4eb_e7d1c38612eb456e8896dffae6fca7da.pdf
    • https://static.usrfiles.com/ugd/ac51ce_de9c37d885634a25b4ce1e50a1319099.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/zaperizuganiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0440/7050/2550/files/bajukolovipore.pdf
    • https://cdn.shopify.com/s/files/1/0437/5366/8769/files/xisamatisav.pdf
    • https://cdn.shopify.com/s/files/1/0437/7015/1061/files/nagelem.pdf
    • https://cdn.shopify.com/s/files/1/0436/7423/9129/files/sufeluraguxugotewuludunu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/wuwebotoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/fikemibijokufuvitesalija.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_off00004793.bin
ad34836d2b14bbc858a2556762f4634edc2897c6bedd00899d0e6d1f4392263c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4793 5460 bytes
font_01_sfnt_off00005a04.bin
2e176c4a8f93d59db6095743849fdca94bec45232c7c89652d46238b27d1df85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A04 9540 bytes

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