Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b5fd43076d5c68…

MALICIOUS

PDF

40.7 KB Created: 2020-09-01 07:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b33e9075077262d68f81cc28b40966b5 SHA-1: 5c19cfac115c5222e4e804f0b17ca8fc2eaba6fe SHA-256: 41b5fd43076d5c68bc680e8e3884a920744b351fffc7b01850e908d0d8af9b9b
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with a seemingly innocuous keyword. This is further supported by heuristics indicating a malicious redirector and a link farm, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=english+handwriting+practice+sheets+printable
    • https://static.usrfiles.com/ugd/756799_4b96441629e348ab93b87781d47087f4.pdf
    • https://static.usrfiles.com/ugd/cfa91a_21849875a2db4b6c97f368d5cca2b910.pdf
    • https://static.usrfiles.com/ugd/b8c837_b82d6f5d1dbb47118c68a5ff1168ab42.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c1c2a3713ab43eab5e5e0d28b856f2c.pdf
    • https://static.usrfiles.com/ugd/0adedf_b3229e23a5a64924b591d8ed23cb754e.pdf
    • https://static.usrfiles.com/ugd/b65acf_41893a7af3b24d4691a3a53bcc2ee791.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc88f8d536d54c9793ab3acb6a5863a3.pdf
    • https://static.usrfiles.com/ugd/804ff6_2b71b6b5d80845238b6115706e79ef95.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e2ceeff3cc145b5b535b7725b6ce195.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/xanazixira.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/jejuximejoje.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/sapawozi.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_off000061f3.bin
b65b322f96a409339c69a60c7e163e26c97f1e7380e8d75f56539c623a456c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F3 5524 bytes
font_01_sfnt_off000074c5.bin
768c39f169d3da5690d1f496f788eff17508431fe8052c54f6282da028c12dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C5 9752 bytes

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