Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82e4f8353aba88e…

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 01:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f310bafb3911915774d2a238d335a6f SHA-1: 9860d83617608621573fd1eedd78e5fa9ddea6f5 SHA-256: f82e4f8353aba88ea105ba9b2d1a35a152603e0a85b28bccd5721dcdfe5b535f
120 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This URL is part of a link farm designed to appear as a free PDF download, as indicated by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though corrupted, contains the same lure text and URLs. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=amor+a+4+estaciones+descargar+pdf+gratis
    • https://static.usrfiles.com/ugd/b8c837_ab202aaed20f4bf793919a3be029d67d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d920c46c2f204f7398cc97e4174d14d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc34892d73aa410796328ad677a3cb17.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c4b3a04de30470ea87aeb24f6f73715.pdf
    • https://static.usrfiles.com/ugd/b8c837_25c13feeb3984f12b9e95bd3a6e0c349.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8437edf42124d90af2ed2b0b7ae2280.pdf
    • https://static.usrfiles.com/ugd/b8c837_997157d551bc4884a913108b97e2cfbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_de06e31410784dde8635aea42a71b47c.pdf
    • https://static.usrfiles.com/ugd/b8c837_58cefc3aef284e358fb09f3a1017fe3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3e5bdc7d51a43e58d102b53d553110a.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_off00005bdb.bin
4aa301b3498c3437710c09c2876f1d9274feb8fee54663532e3921b573288e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDB 5520 bytes
font_01_sfnt_off00006e8f.bin
a428c20cf56c351a4ac27dc82db5b94ac5e8d1c2e7ad73ee78c9a81a130bf248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 11876 bytes

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