Malicious PDF — malware analysis report

Static analysis result for SHA-256 24624e4bfcf50b89…

MALICIOUS

PDF

52.4 KB Created: 2020-07-31 03:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5bdffdcb02918e5c92f30843bd2c19 SHA-1: 02ccdbd2b38d3346cedb6f944a22affaff5dab1c SHA-256: 24624e4bfcf50b891282ada68809bb59fff6a4640146658ac7a227da74f6738e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'casus belli magazine pdf download', suggesting a lure. The ML classifier also strongly indicated maliciousness. The PDF appears to be part of a link farm, with many embedded URLs pointing to Shopify, likely for hosting the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.ru/pify?keyword=casus+belli+magazine+pdf+download
    • http://files.machikweekend.com/uploads/1/3/1/0/131070579/4757802.pdf
    • http://files.christinamariecaruso.com/uploads/1/3/1/4/131453146/5e0a3172031a29c.pdf
    • http://files.magneticislandyoga.com.au/uploads/1/3/1/4/131454567/bevevawudixatuwezoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/zozivefovala.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/nibiditasefajofum.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/84772771116.pdf
    • https://cdn.shopify.com/s/files/1/0437/6962/6781/files/46493454777.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8915/files/rijidugopanef.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/namagozamiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30812088679.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/lewiwidaxojuse.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/webarikabojimegakepugiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/7747/4206/files/16237395843.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/
    • https://cdn.shopify.com/s/files/1/0433/7709/8915/files/r

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f9e.bin
f244152f1735ecea2e0015db16f4eec7c19935d3b03785c1fb693a5a6caaf07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9E 2988 bytes
font_01_sfnt_off00006a4e.bin
f6e5bf7eb08126db4f6a7ca0860e9b7b5e473d208a08279b55c3da29d716fe12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4E 5372 bytes
font_02_sfnt_off00007c8c.bin
1c1c552e9ab42bec638f22dacbac50243542ffea81af416714c25e410bf34f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8C 3340 bytes
font_03_sfnt_off00008a07.bin
142444893cab025b4b1d40bacd00b6ddafbf23c4b15df47810257b143e22334a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A07 10060 bytes
font_04_sfnt_off0000acac.bin
eb49df985c863db098e5748d60751e0bdf461ae071a7d58dcfe3683d2a7c527c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACAC 16616 bytes

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