Malicious PDF — malware analysis report

Static analysis result for SHA-256 de135d5d7a0c0c23…

MALICIOUS

PDF

36.3 KB Created: 2020-09-06 18:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03581fd3352d053c56e2f447751f88a2 SHA-1: 69a28f1ff6d4a9f4ec2614bb8b82c456ddf6e168 SHA-256: de135d5d7a0c0c23da175dd65edacc1824771cff018e21e1b3f77c23b68a3e38
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a form for 'Blue Cross Blue Shield MN'. This indicates a phishing attempt to redirect the user to a malicious site. The PDF also contains a large number of external links, many pointing to Shopify, which is characteristic of SEO-based link farms used to obscure malicious activity.

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/pify?keyword=blue+cross+blue+shield+mn+change+form
    • https://cdn.shopify.com/s/files/1/0433/7795/0870/files/1457719012.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/7739207000.pdf
    • https://cdn.shopify.com/s/files/1/0428/9308/2783/files/cambrian_explosion.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/97715956572.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/96745780796.pdf
    • https://static.usrfiles.com/ugd/19103d_36b9087926234c4892cddd2e0b74c33a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f613e57082049638f1820a491097019.pdf
    • https://static.usrfiles.com/ugd/f59309_a077722a862544c899e999e4b0e6cc1a.pdf
    • https://static.usrfiles.com/ugd/ade4e6_b314f14820f84148975181201cd3ab67.pdf
    • https://static.usrfiles.com/ugd/804ff6_27ee01fc4f7e442f94c1cfa93a76cc9b.pdf
    • https://static.usrfiles.com/ugd/3801ff_da25010edadf4950858e8050ee970ccc.pdf
    • https://static.usrfiles.com/ugd/98d33d_d968e732c892419c85f28212e9937a14.pdf
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/90211878172.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/talanodo.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_off00004fab.bin
047fe6658477e6d5a31b3b9df50c1cd5a3a8fe55df00e70b2bbaa97373e30e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAB 5624 bytes
font_01_sfnt_off0000629c.bin
d8b246e241d92c22a742dbd42473117e82980a80260f9291be519a59b407d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629C 9888 bytes

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