Malicious PDF — malware analysis report

Static analysis result for SHA-256 385a163a9d57c402…

MALICIOUS

PDF

48.6 KB Created: 2020-08-04 21:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f9b7da6e86b096995135d009b98787f SHA-1: 5ecf826edaa84c04715ff67b4f93236362ad0dcb SHA-256: 385a163a9d57c4023c9b1c827e147c19e84bab877e0a6867754e4651ec05c697
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding a significant number of external links. One of these links, 'https://ttraff.ru/pify?keyword=amilcar+cabral+livros+pdf', is flagged as a malicious redirector. The document body contains obfuscated text and metadata related to PDF generation tools, suggesting it was programmatically created to host these links. The primary intent appears to be SEO manipulation or user redirection to potentially malicious sites.

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=amilcar+cabral+livros+pdf
    • http://files.sustainablemaize.com/uploads/1/3/0/7/130738837/vixixovubaral.pdf
    • http://files.innovationcollaborative.org/uploads/1/3/1/4/131453897/gerasiguwaxevit_lovuzufad_lejexulufibox_mudopiku.pdf
    • http://files.oligumm.com/uploads/1/3/0/9/130969740/8528024.pdf
    • http://files.thevirginiaashpub.co.uk/uploads/1/3/0/7/130739399/f9682ea7ad619d.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/aadhar_card_form_download_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/bejewetiwisiji.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/prehospital_emergency_care_11th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/1279/1192/files/minecraft_hide_and_seek_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/metiliwetizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/zigidiwirula.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/xobumowusapovasunuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/83432901586.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0526/files/char_broil_manual.pdf
    • https://cdn.shopify.com/s/files/1/0443/0381/0716/files/fisico_quimica_castellan_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/24668880964.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/newamoferidazowar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6252/files/58311344355.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_off00007d8e.bin
4b8c008456f5bd1f4206968a2049254eb284f986dccda23b6085f7459a00a812
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8E 5488 bytes
font_01_sfnt_off00009023.bin
f332764d1720cbb13c675e32cf566411fc6d4db342af8e94b4cd6ca20c1421c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9023 11000 bytes