Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ad9027af5fa006…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 04:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26f2f4713ff26a3b218f74f7474ff37 SHA-1: d13f332cb86b2797c4d49ec00d2aaa9686b4cf5d SHA-256: 96ad9027af5fa006290abe6ab4d337c1cd8b965f692a08397c69281f1d0d7267
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 `ttraff.ru`. The document body, though partially corrupted, includes the same URL and a keyword phrase suggesting a lure. The presence of a large number of embedded links, many pointing to `static.usrfiles.com`, indicates a link farm designed to obscure the malicious destination. The ML classifier also 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.ru/wix?keyword=cycling+holiday+in+austria+ielts+answers
    • https://static.usrfiles.com/ugd/f14cf6_4a38d5eea1cc48b594376a9163c21658.pdf
    • https://static.usrfiles.com/ugd/ca32a8_a44e81f19b854c53ba764a8eacb8ca8b.pdf
    • https://static.usrfiles.com/ugd/eda9ba_335e1fdb2ae340e8a8524e2be9969340.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2739/files/68400470239.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mogapusezonoxifetomo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/fisica_ciencia_y_tecnologia.pdf
    • https://static.usrfiles.com/ugd/cafc24_89f016f7efb54e13b1fb615d1a70effb.pdf
    • https://static.usrfiles.com/ugd/9904c2_6b6dd4f8db0d4b55ae7b3f25f578b7c3.pdf
    • https://static.usrfiles.com/ugd/d4da64_8eb86724504d43b3aea78b945d79fc1e.pdf
    • https://static.usrfiles.com/ugd/f515ca_b0670148de9f4a5c8ec88a5c9c7119a5.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5878/files/aluminium_6063_t5_properties.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/calendrio_2020_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/fazibolizufodagud.pdf
    • https://cdn.shopify.com/s/files/1/0438/2942/8384/files/23512946183.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_off00006768.bin
cc63c972b9aba260202ae6d4c6e93aaf971405a2393172574ab1decd041bcf5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6768 5300 bytes
font_01_sfnt_off00007974.bin
20911e985c14c31943650b3743cb612f50ebd2f7d78a1e3b36527b05809eb943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7974 10296 bytes

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