Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c64eb2e8b49c85…

MALICIOUS

PDF

65.5 KB Created: 2020-08-03 13:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9efd2bc18321f04045d6f656da81d68 SHA-1: e65577a87fe1260008578f274e74a43c15150297 SHA-256: d7c64eb2e8b49c85e68eec33bb23c5e2bf7cacc3359d88246794f7bd8a081117
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.com', which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL. The PDF also features a large number of external links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic to lure victims. The ML classifier strongly indicates maliciousness.

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=hospital+and+clinical+pharmacy+textbook+pdf
    • http://files.derbylineuu.org/uploads/1/3/1/3/131379406/2ff597c03.pdf
    • http://files.mhecblacon.com/uploads/1/3/1/4/131437351/vasak.pdf
    • http://files.democracyalert.ca/uploads/1/3/1/6/131606636/4469849.pdf
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/vitarures.pdf
    • https://cdn.shopify.com/s/files/1/0429/2100/1119/files/41252414583.pdf
    • https://cdn.shopify.com/s/files/1/0429/8850/3203/files/kazesironugo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8972/9438/files/mysql_split_string.pdf
    • https://cdn.shopify.com/s/files/1/0432/0002/0635/files/53997930000.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/37544605683.pdf
    • https://cdn.shopify.com/s/files/1/0437/7110/1338/files/44774355235.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/mebunigevujufinibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/67940169186.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/25698625020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/37953594857.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/29547266476.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_off0000c295.bin
088cfffafb614225ef3a245d41acbc1811b44656ed242b23af9fde9dc4aec926		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 5732 bytes
font_01_sfnt_off0000d5ea.bin
708bce15a0bd8143bfbeec2d77000171bab2714f6674b68def2c691ee78fe14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 10144 bytes

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