Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e13a2267b68c391…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 13:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a90375449599c981cfbe3e631e5c50 SHA-1: 40da0b7cf924e36255bf6e2b5b37a5b67657f4b6 SHA-256: 3e13a2267b68c3915fb8a523525c4c9f95bb41381ed5b3d4c5435ffb4e0d8e48
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary malicious redirector URL disguised as chapter summaries. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK strongly indicates malicious intent, directing users to `https://ttraff.me/wix?keyword=la+calaca+alegre+chapter+summaries+in+english`. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the document structure and embedded URLs are sufficient to determine the attack pattern.

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.me/wix?keyword=la+calaca+alegre+chapter+summaries+in+english
    • https://static.usrfiles.com/ugd/24853a_921dbbdeb80e45b3946d4828a64d5d06.pdf
    • https://static.usrfiles.com/ugd/88a84f_f315c9942049494c9fb72366189892c9.pdf
    • https://static.usrfiles.com/ugd/f09a9d_2fb0ce363bf348988eaf6cf02fb0d0f3.pdf
    • https://static.usrfiles.com/ugd/96bf9d_6c32d8e2fb0d42f183753a02a838c43b.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_4d2d81f66bb845de8301788af0120dd5.pdf
    • https://static.usrfiles.com/ugd/ade4e6_65a8f4a4bfa647858210bb140d3d4416.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6653/files/xameg.pdf
    • https://cdn.shopify.com/s/files/1/0463/6019/9323/files/informasi_apbn_2014.pdf
    • https://cdn.shopify.com/s/files/1/0447/2979/4713/files/boca_de_pescado_en_tuberia.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/tizoruduletigatasu.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4afea57049f47549d6eebe7b958a90e.pdf
    • https://static.usrfiles.com/ugd/b50c55_e04e83f53658415ebb92d25c1dfe958b.pdf
    • https://static.usrfiles.com/ugd/08fe48_bad0c4b1359e410aa2a5aff4e6bce673.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb6fca7f18444a6a859001c0166b6698.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/
    • https://cdn.shopify.com/s/files/1/0438/2218/665

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c05.bin
2310aad4d8e9fb89ae7deaf659c71cce61a56a9d3640ad0ae03c37713724610a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C05 5288 bytes
font_01_sfnt_off00007dda.bin
eb8af08004a47a2d1be563ddee83794c85902af62b045239983fd31c43e9acf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDA 10976 bytes

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