Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aca1b92ef75863…

MALICIOUS

PDF

43.6 KB Created: 2020-08-19 03:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03cce1649fc88ce1057ea7811acf01ef SHA-1: 8dd4a9dedbcb5e0de4f9721b3f9edea317ac0848 SHA-256: c3aca1b92ef75863f3813f035c24ceab0b67bf4311c0bc61ea81283f2aa8c724
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.ru'. The document body, though partially corrupted, contains text related to educational materials and embedded URLs, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to improve SEO and distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=addition+and+subtraction+flash+cards+pdf
    • http://files.techecohome.ca/uploads/1/3/1/4/131438847/vefuwuvun_bapaxexapidi_dobajemaxopizi_geberuza.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/catalog_cable.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4979/files/11862841050.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/giduxanokuwabojo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/public_ntp_servers.pdf
    • https://cdn.shopify.com/s/files/1/0447/4172/2261/files/zobab.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/simple_and_compound_interest_worksheet_kuta_software.pdf
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/architect_resume_template_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/28276166364.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/slope_stability_analysis_book.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_off00005d77.bin
e4881c0d03a21fd6140cde0121c4355b0336fc0fd2fbc5d7c5ad5a4b220ceb1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D77 5136 bytes
font_01_sfnt_off00006ed2.bin
1008813747995575ce38d4adbdc928f817cca5945922340800b3fe4c4963b8dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED2 10920 bytes
font_02_sfnt_off000093b4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93B4 4324 bytes

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