Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14ed3b8cb13ca0e…

MALICIOUS

PDF

41.0 KB Created: 2020-08-08 02:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 607f2de09adad4d54c9e3debe53a86b2 SHA-1: 21505c1882e545f80c1f1722e5eb03b4c61cb377 SHA-256: a14ed3b8cb13ca0e6db29abdca9e0e980750cc06f755b030295f9193ee0ce4b3
128 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a worksheet. It also hosts a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' heuristic further supports a lure-based attack. No scripts were extracted, but the primary malicious activity appears to be redirecting users to potentially harmful content.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wb?keyword=combining%20sentences%20with%20coordinating%20conjunctions%20worksheets
    • http://tikifarif.awgreekshop.com/uploads/1/3/0/7/130740044/musizavagel-tiwaduxivimeku-gilopitux-jalafov.pdf
    • http://files.hamiltonproperties.net/uploads/1/3/1/4/131438245/3558045.pdf
    • http://files.rollingoakdoodles.com/uploads/1/3/2/6/132680908/b343c27a28933eb.pdf
    • http://files.leonasleads.dog/uploads/1/3/1/4/131406629/8680331e4.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/69916349597.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/text_document_to_converter_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/gixusazowimazodugeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4447/files/reading_certificate_templates.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/antisepsia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/82777965689.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/definition_of_management_by_different_authors.pdf
    • https://cdn.shopify.com/s/files/1/0429/7369/2063/files/english_to_spanish_dictionary_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/tidupasakuvigogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/bash_shell_programming_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/daboledagukikafiziral.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7247/files/o_que_so_assentamentos_rurais.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/33195150930.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_off0000619d.bin
0f21725f615bc337eb5c1ed6b73c733263007d15c715cda2cc4701442a18e2a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 5596 bytes
font_01_sfnt_off0000748f.bin
c239039c9aace0c22d7b38d61c691f8f6cbdf42acd59ba842d41f5062d641b3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x748F 10024 bytes