Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d43fbe392e6b26f…

MALICIOUS

PDF

53.6 KB Created: 2020-08-04 07:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e08b9d9d0b1802fd97a566f57179981 SHA-1: 5d63bae2dd7053c591e250e97d3720d1607d4328 SHA-256: 3d43fbe392e6b26f1fbadf5f8f0b168a42f8335a32c04833383ad22d9320a2e2
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, forming a link farm designed to redirect users to malicious sites. The primary redirector URL is ttraff.ru, which is flagged as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating the lure. The presence of numerous PDF links, many hosted on cdn.shopify.com, indicates an attempt to obscure the final malicious destination.

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.ru/wb?keyword=afro%20blue%20john%20coltrane%20pdf
    • http://files.dwolf.eu/uploads/1/3/2/6/132695651/zenasilu.pdf
    • http://files.monfortestatesdacula.com/uploads/1/3/2/6/132681002/226bb98.pdf
    • http://files.finalflightministry.com/uploads/1/3/1/3/131398194/1081916.pdf
    • http://files.vetsforcareered.org/uploads/1/3/0/7/130776592/4005501.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/31406128662.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/begagoxasumipijomesofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9535/files/99103396788.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/tifutipipumiki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27621352833.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/95653507030.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0647/files/84236569903.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/semisudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5718/files/misapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2381/8139/files/zukaxutubabepolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/dictionary_of_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/tijuzijalajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/mezokepi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e6b.bin
4ca6fc63533231a2c4ac53ee855dc0d5a76c89ebb38ed23d6d71609f4daea5f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6B 5272 bytes
font_01_sfnt_off00009058.bin
3649546e7da48c588f2f30f78d0fba52b9e863437c65817e07c2d6d95a57314b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9058 10560 bytes
font_02_sfnt_off0000b3e9.bin
dcf5bf9068761a66a65f40ee5aed8df972f266ddb8aeda1fcf15af54b1a3ac9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 16200 bytes