Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b99b028d0298c2e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-21 11:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46b4c72297ce3bde548d6521c58e110c SHA-1: 5246d2f99586ee98f95a7bd715167599c49565ed SHA-256: 3b99b028d0298c2e1f9080e0a397580cdd203cbfe141388fcf0f548fbc2a0906
128 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, pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL and a lure related to 'Because of Winn-Dixie worksheets printable'. This suggests a social engineering attack aiming to trick users into visiting a malicious site. The PDF also contains a link farm heuristic, indicating it's part of a larger SEO poisoning or link distribution scheme.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=because+of+winn+dixie+worksheets+printable
    • http://files.juliaschombergart.com/uploads/1/3/1/6/131606815/gigamulavezosexoma.pdf
    • http://saseseto.gezzostruck.com/uploads/1/3/1/1/131163653/wipotubulurajavi.pdf
    • http://files.westernheartsracing.com/uploads/1/3/1/4/131453588/9341068.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/gopowisumalotezedu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0077/files/26196581130.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/54764681324.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70277109097.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5718/files/pufiperenotefav.pdf
    • https://cdn.shopify.com/s/files/1/0436/9815/9769/files/66103873079.pdf
    • https://cdn.shopify.com/s/files/1/0441/0785/8072/files/labemimoxodalukewixepes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/vapozivun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4246/3126/files/27907851770.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/vuwutisubozut.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/92979753875.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_off00006070.bin
81d88b6b39428e1269ec67b6e38c817b37ad47f718115015c09dfa4a2c4bb129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6070 5656 bytes
font_01_sfnt_off000073b2.bin
54670aa93a2d1a3832cc75d1cd15d1123cd7dd45f23ac10871fe84a149ed8adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 11128 bytes

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