Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31d4da6a0426231…

MALICIOUS

PDF

39.8 KB Created: 2020-08-06 10:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5af025e9dfe602c2ca796d6a69ee9266 SHA-1: 3b537fb00572e77801b8cfc4eed0d4dcebd70217 SHA-256: f31d4da6a04262319d4b99d52ebb2a95458a213ab5cbb554472d206b4f83fd1b
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=vapour+absorption+refrigeration+system+pdf+nptel'. This URL is likely used to redirect users to a malicious site. The document body contains garbled text but also repeats the search query, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content.

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.ru/pify?keyword=vapour+absorption+refrigeration+system+pdf+nptel
    • http://files.sagehairstudioreno.com/uploads/1/3/0/7/130775196/jiseseguviji-ralanos-gedumewekozepaw-fadodorati.pdf
    • http://files.amagier.com/uploads/1/3/2/6/132696067/93fe0.pdf
    • http://files.abdullah-francis.com/uploads/1/3/0/8/130813796/raradofeva_kovibukukifid_gagomen_zomifun.pdf
    • http://files.froufrouproductions.com/uploads/1/3/2/6/132683142/4795448.pdf
    • https://cdn.shopify.com/s/files/1/0443/4988/2524/files/diagnostic_microbiology_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/jepisejugetotidak.pdf
    • https://cdn.shopify.com/s/files/1/0437/4046/3255/files/18152794795.pdf
    • https://cdn.shopify.com/s/files/1/0441/2401/2696/files/anatomie_et_physiologie_du_coeur.pdf
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/96964644686.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/58022868097.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/nasazofajepi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/biwuvakurivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/levij.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/62941584871.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_off00005d15.bin
f915a77ad37c29c609af79a868942a1d295bbabe715abb104b25636fc7998d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D15 5568 bytes
font_01_sfnt_off00006ff1.bin
67227990c1df7d3c3f29be3982c3f332168727d45623605351444859f37be068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF1 10068 bytes

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