Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e5164fa8447c10…

MALICIOUS

PDF

44.7 KB Created: 2020-09-02 13:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a52e8f4751c6ca4902197c4a645524dc SHA-1: 4240268cb0a53cd1cb055d629614ebb1d3c72987 SHA-256: f8e5164fa8447c1099e836e2df9be5b560e5054833675be1ddc6ea1e627cc9f6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/pify?keyword=hypertensive+urgency+treatment+guidelines+2019'. This URL is presented within the document body, disguised as medical guidelines, indicating a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be directing the user to a malicious site.

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=hypertensive+urgency+treatment+guidelines+2019
    • https://static.usrfiles.com/ugd/6c313a_d3cd98ff16414760a20ea05a68c4495b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7ad1b28489c4ecb8a9d12318e518c9b.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_e426c2f32c9441b895400f83e65ec420.pdf
    • https://static.usrfiles.com/ugd/83e24f_7434fee9009e4fa58544d27b5ab72e5b.pdf
    • https://static.usrfiles.com/ugd/c83fdb_a8c4e311e8c5405b9cb7bb325453e962.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/bujejefedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/78553739863.pdf
    • https://static.usrfiles.com/ugd/b8c837_6faa324095fc4f1093127f55ec6fec03.pdf
    • https://static.usrfiles.com/ugd/57c819_eddc426700964a1e9d837ef87faaf765.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_36610e6b300c4857a45a0c306c8ee86e.pdf
    • https://static.usrfiles.com/ugd/72216b_fcc4e125d18149beaa61785e35a93584.pdf
    • https://cdn.shopify.com/s/files/1/0429/0736/9639/files/lowupazuba.pdf
    • https://cdn.shopify.com/s/files/1/0430/7314/2935/files/vosulalexike.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_off00006ef1.bin
b3b60c09d71e3e64c60da074ac53232ed6eabf85ef3cfef7e1497c82fa3ec6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF1 5996 bytes
font_01_sfnt_off00008355.bin
c97ad28523bacb00de1c3b08087ba90248c642458f1155cd24300e15aed7d694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8355 10032 bytes

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