Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42a8af94ee6fff1…

MALICIOUS

PDF

41.5 KB Created: 2020-08-19 18:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b797fe7ea1838673f769fd29addeb511 SHA-1: ed866007fa19a8ec7085a56bcb52a422790d77d0 SHA-256: d42a8af94ee6fff147eb92336469c626418bd05eebcdcde32821a03ed05c2d0a
150 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.cc. This indicates a link farm or redirection strategy to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on the malicious redirector URL.

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/pify?keyword=passing+function+pointer+as+template+argument
    • http://files.scbailacademy.com/uploads/1/3/1/4/131437671/5953042.pdf
    • http://ronepixov.carthagechurchofchrist.net/uploads/1/3/0/7/130775309/luvidepofus_xetorekafa_samudarasekuga_binog.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/3598057567.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/21850345853.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/kobijepumisazulataseg.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/best_books_for_learning_french.pdf
    • https://cdn.shopify.com/s/files/1/0434/9358/9142/files/bekovuvakedudove.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/panasonic_kx-_tg7871_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/1497021510.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1365/files/kumetobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/80700104745.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_off00005a9d.bin
4a8d9e6c2f535d6d805c9cf041c23625694a0f766d9a292cd32f743d8adcf20c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9D 5336 bytes
font_01_sfnt_off00006ca8.bin
65aa25172405c05a569498ab9e9e0d084d1123cdd95a0e08312c3a7ab3b4a593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA8 14280 bytes

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