Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8e08fc3cf31d64…

MALICIOUS

PDF

51.1 KB Created: 2020-08-15 12:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54f72cf35e63e6ce1dff53138fc6434b SHA-1: dfa57a88fbae9cfff2c8e02d2f26682715256a8c SHA-256: cd8e08fc3cf31d647207f6ae2c56a92aa33dfd4ecd22ec28de8099314039998a
120 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, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wb?keyword=dengue%20pdf%20in%20bengali', which is flagged as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' further supports this by identifying a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute 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/wb?keyword=dengue%20pdf%20in%20bengali
    • http://files.shsoh.com/uploads/1/3/1/4/131406744/mujupirawoz.pdf
    • http://files.gilphotography.com/uploads/1/3/2/7/132712214/lesuw_tinepapoga_xesemalibi_wovib.pdf
    • http://malekum.premierbreederwebsites.com/uploads/1/3/1/1/131163763/a79b2913fb.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/20899507359.pdf
    • https://cdn.shopify.com/s/files/1/0451/7340/7893/files/botod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5144/files/60079668967.pdf
    • https://cdn.shopify.com/s/files/1/0428/2194/3463/files/92479367245.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/govemojivudefugi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/cuales_son_los_generos_periodisticos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/business_analytics_case_studies.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/python_greek_letters.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6502/files/zowabukoxamudova.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/60805827426.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/arraylist_implementation_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1252/files/alleluia_randall_thompson.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_off000066e3.bin
3c223b53971c297b6aac252d27d64094edfe51af7ea036c271f9c246fb08a3b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x66E3 5072 bytes
font_01_sfnt_off00007839.bin
cef67afd7f2e1956025c94b30988445356cfb2351f6469370b07727392a8b7f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 12204 bytes
font_02_sfnt_off00009d15.bin
6094c7aee2c3fba73ef7a1e14f976fc48683c08e18ad4dec8c90a93623736079
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D15 9992 bytes