Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6d3ae1ba392d0d…

MALICIOUS

PDF

52.3 KB Created: 2020-08-19 02:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75c2780100f30c4c4fd895344ce77fe2 SHA-1: 6d568a110796add12682969c029475ee48cfe461 SHA-256: bc6d3ae1ba392d0d9bfd5d5adba0ffb7be856dbcdfdca12f5bb75b6d5883128d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but also includes a critical link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=pruebas+bioquimicas+e.+coli+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a likely phishing or SEO-based malicious distribution scheme.

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.ru/pify?keyword=pruebas+bioquimicas+e.+coli+pdf
    • http://files.fabinashelties.ca/uploads/1/3/1/6/131637814/3342110.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2262/files/wekemigogojugezifas.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/43871114239.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/50707428953.pdf
    • https://cdn.shopify.com/s/files/1/0437/5986/1909/files/clicker_programing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/40787679447.pdf
    • https://cdn.shopify.com/s/files/1/0434/5724/9430/files/21359990933.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/1336474332.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/kexiditegekaruva.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/esl_lesson_plan_templates.pdf
    • https://cdn.shopify.com/s/files/1/0433/5602/9093/files/dutokawovabiranida.pdf
    • https://cdn.shopify.com/s/files/1/0437/7234/6526/files/20481487476.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/vatisedeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/japan_car_auction_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0443/8307/6518/files/cellular_respiration_virtual_lab_answer_key.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_off00008df7.bin
6b086f0e732558c1074686474f99f069d3e9e64622d201971520ca38aa60a786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF7 5600 bytes
font_01_sfnt_off0000a0e3.bin
095f67a5da2c7ca1088ba767366343761a0b1ecb4ee8aa6a95f7b3dab4c1e0c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E3 10476 bytes

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