Malicious PDF — malware analysis report

Static analysis result for SHA-256 539bfe4751f6d531…

MALICIOUS

PDF

44.4 KB Created: 2020-08-21 11:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1bb888c8c1598dc0e8d1f3552b060d SHA-1: dd2cab025ef9397286e2a65cdd0b293c6a4e1c14 SHA-256: 539bfe4751f6d53109f69d97bbe458e1d4974117d01c10c9c8f78e423bcc3942
150 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, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Cargill inc annual report 2015' and the malicious URL, suggesting a phishing lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, likely used to obscure the malicious redirector. The primary malicious IOC is the ttraff.com redirector URL.

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=cargill+inc+annual+report+2015
    • http://gexabinov.pre-protein.com/uploads/1/3/0/9/130969761/120f35.pdf
    • http://files.filipinocursillosf.org/uploads/1/3/1/1/131163879/6df242.pdf
    • https://cdn.shopify.com/s/files/1/0440/2118/6718/files/pneumatosis_cystoides_intestinalis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/16195770928.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/75456981372.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/netalaguliji.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0597/files/48086471962.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/sejafekabaxezatakap.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/73633445204.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/hotel_italia_buongiorno.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/juwexejekufij.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_off000061c0.bin
76dbd93de22f39d827caf08cc481b8c1a57c2e1a046decfead44cb0206145165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 5276 bytes
font_01_sfnt_off000073c8.bin
47376de005c4f7088e3f229e20a8f7141797388b1f77dff3b46444af7f7876d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C8 10132 bytes
font_02_sfnt_off00009662.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9662 4324 bytes

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