Malicious PDF — malware analysis report

Static analysis result for SHA-256 c423377db918a1ef…

MALICIOUS

PDF

34.8 KB Created: 2020-08-15 23:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a68a5ed4cfcdf68dd789d8bc48f89393 SHA-1: f6ba61b3a503ef3ea34d0cf29f6446c787d0c5a5 SHA-256: c423377db918a1effd8410239cec46045a832b54266ceca970993b881c35ae15
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm or SEO manipulation, with numerous embedded links to external PDF files. One of these links, https://ttraff.cc/wb?keyword=casadio%20dieci%20a1%20manual%20pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm and a redirect to malicious infrastructure suggests an attempt to lure users to harmful content.

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.cc/wb?keyword=casadio%20dieci%20a1%20manual%20pdf
    • http://files.southernaddictiondecor.com/uploads/1/3/1/6/131637362/7413174.pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/lubemivukunugarexaxige.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/finorip.pdf
    • https://cdn.shopify.com/s/files/1/0436/8800/1689/files/tulotufebemegom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7599/files/jevedu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/verbe_irrgulier_anglais_avec_traduction_franais.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6207/files/92448396144.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/tupowutumufazem.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/25746328424.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/business_annual_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8418/files/ipl_2020_schedule_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/5897/8207/files/xewodugoruwizoniwarosa.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_off00004b7b.bin
c25dd20f458547c94b57f351e69c1c930880bada3b98c54853e1f2a50b209246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7B 5164 bytes
font_01_sfnt_off00005cfb.bin
df7cbb2afdca399b092d64588195da94bce5f43a8453dbf1ad22d0e8f03fd1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFB 10060 bytes

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