Malicious PDF — malware analysis report

Static analysis result for SHA-256 521efac637896a78…

MALICIOUS

PDF

36.1 KB Created: 2020-08-20 14:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98ba15546539abb93ec7842e8b8c20d2 SHA-1: b9bfaa8c8075214a21a9b45f8fb34205b56b6ff2 SHA-256: 521efac637896a7830e0ebde1138fb9ddc9510fe3993649f9521d7d12a6fe8ed
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.com. The document body, though heavily obfuscated, contains text related to 'microsoft access tutorial video free' and the malicious URL, suggesting a social engineering lure. The presence of a malicious redirector link and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

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/pify?keyword=microsoft+access+tutorial+video+free
    • http://wemavit.robertkaltenbach.com/uploads/1/3/0/7/130775364/4840637.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/denobuvevirapabisutorab.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/76432202160.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/smd_diode_bridge_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9957/files/49648319649.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4982/files/bhagavad_gita_in_marathi_audio_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peposorutap.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/tudurezipijijugop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/89640589119.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/82995886006.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/weekly_activity_schedule.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_off00005112.bin
dc5131ea2757756e883abe7c3838cbe1b30d54be99e359c0b25d523bda4acf6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5112 5080 bytes
font_01_sfnt_off00006269.bin
2c5f597113515d555b3b38882a18c33cf480256ac0f0a3da747b61787fc1b84c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6269 9752 bytes

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