Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5af8710f0d26812…

MALICIOUS

PDF

68.8 KB Created: 2020-08-07 05:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c1d6ec7325b667fc482f8a489578999 SHA-1: ca99ce400b2190617c3ed877f83dd79baae0ca32 SHA-256: d5af8710f0d26812e77ad904ddd66234ee36ab6a89e3813f4ca494c6b2b9e2fa
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic fired, revealing a large number of embedded external links, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.cc/pify?keyword=acido+y+base+pdf, which is likely used to redirect users to a malicious site. The document body contains garbled text but includes the malicious URL and several other PDF links, reinforcing the link farm attack pattern.

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=acido+y+base+pdf
    • http://files.dnacrobatics.com/uploads/1/3/0/8/130814769/ruzegoxune.pdf
    • http://files.thehomeschoolgarden.com/uploads/1/3/0/7/130776503/mizadabetuwot-tujoxad-luxititam-vuvefalu.pdf
    • http://files.drwilliammunro.com.au/uploads/1/3/2/8/132815872/1f8fcc2d.pdf
    • http://files.canberraveterinarycrisisfund.com/uploads/1/3/0/7/130776483/bijiguvutu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/9727220222.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/dogipatuzofatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2019/7789/files/90904012375.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/buxisi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/dujupis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0430/9978/3319/files/69741949.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/galugixanodegapu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2957/6352/files/gobibivifewejewedovisale.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/famonumigutev.pdf
    • https://cdn.shopify.com/s/files/1/0432/9111/5678/files/brachycephalic_syndrome_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/kitojobusag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097a5.bin
db65b25c37f12ee23d5f950b829f9c1a3508f2dcf825f0a90e02876ce7a1b0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A5 6756 bytes
font_01_sfnt_off0000ad9d.bin
9e990f5410d6c8db31a10ed270b79a8c098b513d82f3b5e0899d9ee4fbf3e9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9D 5252 bytes
font_02_sfnt_off0000bf9a.bin
e7acd87e5979007335f57ceb0a741f43eef2e572988eaea9a27333cb8375b309		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9A 16532 bytes
font_03_sfnt_off0000f14a.bin
dd623c2e4b2147c2f7333d3c498093e2ac050c7884d0c32cc27f4d3210532701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 16060 bytes

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