Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c40aa82e2ae4d3…

MALICIOUS

PDF

41.0 KB Created: 2020-08-04 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8abb4aa856a645e7dad9947e4337493d SHA-1: d03d44c463a81985fd08ab0dabdd2dd0fd3b1b20 SHA-256: 39c40aa82e2ae4d342dd86d4a5a19cbfe1a31c7f28febe36d2e202ae2dd23341
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=watermark+pdf+pro+dc', suggesting a lure related to PDF watermarking. The primary malicious IOC is the redirector URL, which likely leads to further 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=watermark+pdf+pro+dc
    • http://files.caraleemath.com/uploads/1/3/2/8/132815924/5b1431fe3be.pdf
    • http://files.jjenterpriseslcd.com/uploads/1/3/1/1/131163867/7835554.pdf
    • http://files.rcwalter.com/uploads/1/3/0/7/130739919/lorufavero_taravonudip_wodakagatedimet.pdf
    • http://files.chloescockers.com/uploads/1/3/2/7/132710763/8628405.pdf
    • http://files.lifeonthevineministries.com/uploads/1/3/2/7/132710628/zakomunupaxeva.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/fuxapulafekab.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/anne_of_green_gables_story_summary.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/16434848950.pdf
    • https://cdn.shopify.com/s/files/1/0438/6557/1493/files/sometenuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/35820184117.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/gexanekomefolumowuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/please_find_attached_the_file_you_requested.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/mamefufafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/23897947228.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/xevejikemugupadisa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/melozanupotix.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_off000063b0.bin
5d6b9d331ec7661ebf9466b60c13a2095406b09d82324a128c0b745a577ee7da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B0 5168 bytes
font_01_sfnt_off00007545.bin
de432070777146175ddac1bdb714af8e593d65104058bf96ffca48665ff54905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7545 10012 bytes

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