Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdce43a5d9dceb8…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 11:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 963ad3097984f955639b39280e2cba90 SHA-1: 7dde459ef0d9dcc3f0b4d4ad98c0418a664b80d1 SHA-256: 4fdce43a5d9dceb84bf04714e4b7244aee284767e158da1c7ddc5f5609e22140
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a worksheet and includes the malicious URL. This suggests a social engineering attempt to trick the user into visiting the redirector, which likely hosts a malicious payload. No scripts were extracted, limiting the analysis of the payload delivery mechanism.

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.me/wix?keyword=median+mode+range+worksheet
    • https://static.usrfiles.com/ugd/516793_e94b91ef64f64260b1320847d5b8e2c3.pdf
    • https://static.usrfiles.com/ugd/b58d21_acfed04547db4967a400e1879030121e.pdf
    • https://static.usrfiles.com/ugd/ea78e0_3474fd0c3dfb4f9c862ffa0cb94931df.pdf
    • https://static.usrfiles.com/ugd/b88e3d_1576e61741354589b74deafff44551da.pdf
    • https://static.usrfiles.com/ugd/defdb4_9551d0800dca4a4887ea946841b2b961.pdf
    • https://static.usrfiles.com/ugd/b8c837_311dbce3144d43c98b3106dcf7d0116c.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_96db567f593841fb8b2095263abbca23.pdf
    • https://static.usrfiles.com/ugd/cf14a4_10605f59a37449d18feca3409b0b9a20.pdf
    • https://cdn.shopify.com/s/files/1/0461/9026/4469/files/punamokixesimubum.pdf
    • https://cdn.shopify.com/s/files/1/0435/7770/4607/files/thinking_in_java_8th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4785/2959/files/81561877809.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/vupawin.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_off000068c1.bin
2c6c8e2a06633f753a92752928ef4fad0201e43b24b014b5ec945af37adee64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C1 5368 bytes
font_01_sfnt_off00007af0.bin
f8351f0ab6d38fbc6269342c4ded48b51fce6100ec973aa527fff621bcbe8467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF0 10328 bytes

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