Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dab2419fb77cce…

MALICIOUS

PDF

38.1 KB Created: 2020-09-01 05:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b72b058de7245ee1555c1f691ecd93f8 SHA-1: a4ce1de0f5f42a8458955f51a7332bbfc859a891 SHA-256: e9dab2419fb77cceca96894f4c48e843f8a20d2c0d25538f8598dd0b2a379808
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, pointing to 'https://ttraff.cc/wix?keyword=decimal+fractions+worksheets+3rd+grade'. This URL is presented within the document body, disguised as educational content. The file also exhibits a PDF link farm heuristic, indicating a large number of outbound links, many of which point to benign-looking PDFs hosted on static.usrfiles.com, likely as a distraction or to improve SEO for the malicious redirector. The ML classifier 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.cc/wix?keyword=decimal+fractions+worksheets+3rd+grade
    • https://static.usrfiles.com/ugd/b8c837_854ccda3cc304d0586db2b2da9a270c3.pdf
    • https://static.usrfiles.com/ugd/724bd4_a5c78fd4b3134ac5a9f7b88f58e7e5b1.pdf
    • https://static.usrfiles.com/ugd/7baf93_36c035f3917b4d83b93f3f67c32fe072.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/28610965148.pdf
    • https://cdn.shopify.com/s/files/1/0449/7919/1966/files/89440906994.pdf
    • https://static.usrfiles.com/ugd/b8c837_062531f5b7a641fdaaa0b3fccb86bb02.pdf
    • https://static.usrfiles.com/ugd/dc51bb_a60fa27268aa4003b2b128c3fe15034b.pdf
    • https://static.usrfiles.com/ugd/3eed2b_a9636eed5e19439aa864c21a707dd21c.pdf
    • https://static.usrfiles.com/ugd/fafc38_861d1d411f044b378246b08bc27e30de.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_c7bdb269def94a5a95181cfa84c35793.pdf
    • https://static.usrfiles.com/ugd/b8c837_19680482a7be48d08e774584cefef8e6.pdf
    • https://static.usrfiles.com/ugd/b916f4_75b579e1348a4952ba1167b82bbae8d3.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_off00005551.bin
b4cdd9b050607c540e757e7d6834d60b15cc2d07c8d7f11b9785203dab73f84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5551 5752 bytes
font_01_sfnt_off000068d4.bin
736736928e183804efe9c232fc2ee03bef7caf71816c611c94559af3501807a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D4 10200 bytes

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