Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1abf6d4fc6ffc2e…

MALICIOUS

PDF

34.3 KB Created: 2020-09-05 13:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2f9d850e9b10338f598beafb828a4bd SHA-1: 6d8d40fea1d51fe538436cbb968e0804ba3bd1df SHA-256: d1abf6d4fc6ffc2eecaf7bf82810afe43a2f14039230214c81fe5395d7e9b17b
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/wix?keyword=computer+organization+and+assembly+language+notes+pdf'. This URL is embedded within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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=computer+organization+and+assembly+language+notes+pdf
    • https://cdn.shopify.com/s/files/1/0435/7128/2079/files/amedspor_forma_logo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/mawetizugakajoba.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/dikexe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/23411315899.pdf
    • https://cdn.shopify.com/s/files/1/0432/4468/3419/files/panarisodixisilakelepo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://static.usrfiles.com/ugd/5a4aad_b99c91aa56254264be9f7bc31ca1c2cb.pdf
    • https://static.usrfiles.com/ugd/9dda13_43b8f1f680c24648b04b4ec67856d028.pdf
    • https://static.usrfiles.com/ugd/b8c837_2022151995844827939005307418c717.pdf
    • https://static.usrfiles.com/ugd/ea2f88_b79132cc4b39487d9326c680257be2ac.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/hernando_alvarado_tezozomoc_cronica_mexicana.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/strona_bierna_angielski_zadania.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_off000040b2.bin
0f3cd0311297604d5b28e24cae5e3854eb0b9b14417dec8f4a827c9f7c62d5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40B2 5556 bytes
font_01_sfnt_off00005385.bin
0af990a93090666ad54ba36ef9f4e9e8c019ea367ac68eae2b803e2a5cc8b091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5385 12328 bytes

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