Malicious PDF — malware analysis report

Static analysis result for SHA-256 9baa4a7e1ebefefb…

MALICIOUS

PDF

43.3 KB Created: 2020-08-29 07:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab28d2a8316eaed794a5f47314cd3d82 SHA-1: c39e9b61df22371ffa0c93c1f487bf85f9eb0b89 SHA-256: 9baa4a7e1ebefefb60f8767ab407fbbfc5a66f347a5e22ad15369c8752b6cb50
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=servsafe+food+handler+guide+answer+key
    • https://cdn.shopify.com/s/files/1/0451/2923/6645/files/chemistry_notes_for_ssc_exam.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/14912546187.pdf
    • https://cdn.shopify.com/s/files/1/0435/4719/7594/files/clack_corporation_water_softener_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/89851171314.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/apcob_previous_papers_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/8029694013.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/busovuwirokibi.pdf
    • https://static.usrfiles.com/ugd/b8c837_33d8c61b388f47fc97ebbf1c00f5c01f.pdf
    • https://static.usrfiles.com/ugd/b8c837_95797f8b807143c5af5fd41e7d5949e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3b7e6ba1dcd4a3a8e9da07b81913988.pdf
    • https://static.usrfiles.com/ugd/b8c837_f451dc816fca4411af055875a0af53e9.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/2460422620.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77439678162.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_off00006a7c.bin
aca3ba6b6a54dc3a1fbbb091bcd9ba22a089374720b1d1e16ca338ee5b5af58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7C 5592 bytes
font_01_sfnt_off00007d96.bin
07b344aa22f18daad6a84818b3119fecb485d1109172b176c3dacf2113e9837d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D96 10392 bytes

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