Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ab8eb419e2e130…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 23:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8249b43b1142052b3fd39f42656a426 SHA-1: 4dd71a9793b925d69cc72c80d03d6a30fc72dc36 SHA-256: b7ab8eb419e2e13021701ebbd14c556084f304fd86d5e09acaa0be2053464546
152 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, directing users to 'https://ttraff.cc/wix?keyword=box+of+wine+costume+template'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of numerous external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to distribute further payloads. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=box+of+wine+costume+template
    • https://static.usrfiles.com/ugd/ea78e0_f10a34b3bc614401b5fb30931f35f67b.pdf
    • https://static.usrfiles.com/ugd/b8c837_24029676a1e841fd88e991b941f4c2c0.pdf
    • https://static.usrfiles.com/ugd/576447_16055dd6b30a40e796cf791858db5a99.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_2d05987c4e5d4834b13be39154a613be.pdf
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/lobetidanetiwamubos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4150/files/29049770165.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/sony_a5100_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6063/files/liliwag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/35406914272.pdf
    • https://static.usrfiles.com/ugd/fe83c3_830bceab350845ebba9eb45b71258536.pdf
    • https://static.usrfiles.com/ugd/c1108c_3f43c3c674c4411f86eec8762aa5420b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6a3ec104de940039daacf2f0f0ef7af.pdf
    • https://static.usrfiles.com/ugd/23e9be_adac0506effd409d9d97b9c546c06e55.pdf
    • https://cdn.shopify.com/s/files/1/0437/3885/7623/files/black_root_burrows_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/fuguwigezuba.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_off000070db.bin
fd219eddae827b907c831226c10e0564465e8d007132464842f8f3ceb04ed685
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DB 5272 bytes
font_01_sfnt_off000082db.bin
6b7e95ab893772b73bafd51dd0ab290f338e445fa0e0e731bd9e3ff7d9a1928b
pdf-font-stream PDF embedded font (sfnt) at offset 0x82DB 10420 bytes