Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0103a39fb5699b…

MALICIOUS

PDF

40.3 KB Created: 2020-08-19 13:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 521dd6a81be3b9dc2042bf3c9f7bc44a SHA-1: b48620f3a9a8e461b0d9b4979d4b54fb3faa3f78 SHA-256: 4a0103a39fb5699be91c0611360b7e5b07d333cd1630fa5317580abbf0aaa7ff
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.cc/pify?keyword=classical+guitar+sheet+music+free+beginners', leads to a known malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted, but the PDF structure and link farm indicate a social engineering tactic for phishing or malware delivery.

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.cc/pify?keyword=classical+guitar+sheet+music+free+beginners
    • http://files.emexon-international.com/uploads/1/3/1/3/131381681/dimanoraj.pdf
    • http://files.debcrooke.com/uploads/1/3/1/8/131871614/rigodovu.pdf
    • http://files.mindhealthconnection.org/uploads/1/3/0/7/130775974/xukevakuvezulenejum.pdf
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/dinojukosilaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0576/files/xfdl_viewer_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/brassage_genetique_cours_terminale_s.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/34019067145.pdf
    • https://cdn.shopify.com/s/files/1/0452/1210/6912/files/abc_biology_book_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/para_colorear_princesas.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/zipiselokarinebotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/sukiziwujojadof.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_off00005eeb.bin
a69c2bb81159674360b1c397aeeb2bfea970150b3569fb391ca42bc5a18b64c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEB 5340 bytes
font_01_sfnt_off000070ea.bin
03afc317b8e5611135c34b517c5bfbf8d173cb98e5b6da471bc0beb43e29f517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EA 10308 bytes

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