Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a3e72eb893aade…

MALICIOUS

PDF

41.0 KB Created: 2020-08-10 16:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f98b870e6f6a592350241a256085189 SHA-1: 05e9fa21b54822c24d9ae52bd4a9519bd3cc32f4 SHA-256: 88a3e72eb893aade5fc90dc971f395f091ac5192a87dc47569346eb9ea3c8f00
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of these links, 'https://ttraff.com/pify?keyword=conjunctions+exercises+pdf+intermediate', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure for users interested in 'conjunctions exercises'. The primary goal is to redirect users to malicious infrastructure.

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/pify?keyword=conjunctions+exercises+pdf+intermediate
    • http://files.transformingliveschurch.org/uploads/1/3/1/4/131438563/2664414.pdf
    • http://silajuwo.northernriversbathroomrenovations.com.au/uploads/1/3/1/4/131408738/xepukuxa_kofilon.pdf
    • http://files.hillsideschoolcville.com/uploads/1/3/0/7/130776043/muvetatatokuxep.pdf
    • http://files.rakshitestates.com/uploads/1/3/1/4/131407138/9151567.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/1326345950.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/marepuwofaruzok.pdf
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/advantages_of_computers_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/safosufiwasadil.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/5951467455.pdf
    • https://cdn.shopify.com/s/files/1/0430/8176/0935/files/vulegebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/74350839201.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/23671780065.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053b1.bin
bbeeb304fc08129b935ab38909b56c7101a5b7b5719460aa779be8226a1a7cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B1 5316 bytes
font_01_sfnt_off000065b6.bin
faeccde3873e3c72a49b9b9f6ddca0dd79bdfea296cb506a3bb343365bbb34de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B6 10576 bytes
font_02_sfnt_off00008906.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8906 4324 bytes

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