Malicious PDF — malware analysis report

Static analysis result for SHA-256 287de3acfb7634b2…

MALICIOUS

PDF

37.5 KB Created: 2020-08-31 20:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9431398b6bfdfb13aae43e0120129bf SHA-1: 94c45dceb1666a60a690ad18f5b1b0bdcb3776b6 SHA-256: 287de3acfb7634b25775c03ca964424fcbca9cd8d022340656c3ed10d94f5a13
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/wix?keyword=butcher+baker+candlestick+maker+riddle+answer. The document body, though heavily obfuscated, also contains this URL and references to a riddle, suggesting a lure to entice users to click the malicious link.

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.ru/wix?keyword=butcher+baker+candlestick+maker+riddle+answer
    • https://static.usrfiles.com/ugd/dcfb95_ee1813eef97f4559a3f9e971e34bd6b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc6933162151455281b8f86a392b2165.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbe712cf79044c0db5f095efe17b8408.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6ee4b485994e83a8f61d18f6b92ae3.pdf
    • https://static.usrfiles.com/ugd/3ce946_5fe031cc529f4dc8b60a5b52482ff45a.pdf
    • https://static.usrfiles.com/ugd/510a18_4303dda0810546bc881c8d722468ebca.pdf
    • https://static.usrfiles.com/ugd/cf14a4_ae2fa77f6802462f8d6eec7727852185.pdf
    • https://static.usrfiles.com/ugd/48d9a1_beaf1960da744a3d90e4411414d45e36.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1219/files/sajafikipepebasaxikisef.pdf
    • https://cdn.shopify.com/s/files/1/0433/8778/1287/files/local_literature_about_absenteeism_i.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/89641855825.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f776df66d0d40f7ade6c47fe730638f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8895a66aa5e94c0aa5629c65ffb013c7.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_off000053d5.bin
5c2f94f192450e9beb53119937efead751f24be8635ed18f37523d51ddf36c4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x53D5 5524 bytes
font_01_sfnt_off0000667e.bin
7c2af013896ef0dfc9942d1cfee5bd0d7b77e495d640830d20a8c6555ed3961a
pdf-font-stream PDF embedded font (sfnt) at offset 0x667E 10124 bytes