Malicious PDF — malware analysis report

Static analysis result for SHA-256 348b35f48102dbc4…

MALICIOUS

PDF

48.1 KB Created: 2020-08-02 16:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c353ef64ce1db11d79619d483878fafd SHA-1: 0ac8129c43daa57d25bb13faa7911fbf09cf473e SHA-256: 348b35f48102dbc4240fe20d5b52016e9ef3e445d1e0848a97c9490304e5c8bf
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, https://ttraff.com/wb?keyword=miscellaneous%20antimicrobial%20agents%20pdf, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to direct users to malicious infrastructure. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/wb?keyword=miscellaneous%20antimicrobial%20agents%20pdf
    • http://files.nerdybirdieapparel.com/uploads/1/3/0/7/130776757/d89b8.pdf
    • http://files.amberemson.com/uploads/1/3/1/4/131406321/xinumuvad.pdf
    • http://files.lagom-online.com/uploads/1/3/0/7/130775191/tobaxowex-rufofevux-tabovesilimi.pdf
    • http://files.mylunarsign.com/uploads/1/3/1/8/131857482/6fcae3.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/torujipu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8170/files/tukobex.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/28329391293.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/kidogibunowigelulan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/33488891906.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/94696820140.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/52663188190.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3784/files/24747231998.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/27476774775.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_off00007ce8.bin
10ee42b9b1b58599157db94bde48d69398be9b26914457e163ea50d3ee24bc3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE8 5620 bytes
font_01_sfnt_off00008ff6.bin
c75a3ebc8681ad28dfbd92019d85f846ff35dd3c0ef0512bc0039f1dc6bdb685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF6 10644 bytes

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