Malicious PDF — malware analysis report

Static analysis result for SHA-256 472ed6ce045f4da0…

MALICIOUS

PDF

45.6 KB Created: 2020-08-31 20:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db503fc472b70191c8cf9ae9f20b23b9 SHA-1: 8232ac509fc24ecad6455bd638b88b037900b87e SHA-256: 472ed6ce045f4da0b389221f7e995e49ebc69adadac4375c7daead14ad13e67d
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, pointing to 'https://ttraff.cc/wix?keyword=crescent+beach+wave+report'. This URL is likely used to redirect the user to a malicious site. The document also contains a mass external PDF link farm, with many links hosted on 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and several benign-looking PDF links.

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=crescent+beach+wave+report
    • https://static.usrfiles.com/ugd/b8c837_0d3a9aaa7b394840a10067bfcc32ede7.pdf
    • https://static.usrfiles.com/ugd/b8c837_918d3542822e467e8f33e6b204f84bed.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c6ca8ab3c047ce8bc65f36f4d9e784.pdf
    • https://static.usrfiles.com/ugd/c345b0_6b35283920854e8bbe323adc1cdbe53e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca6aca370f124b1b9c1597a557f422a9.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2581/files/rigizasaduwovikadi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/gonegofatijefilesugiwoni.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/xarevakufawimune.pdf
    • https://cdn.shopify.com/s/files/1/0438/2231/7725/files/tetij.pdf
    • https://static.usrfiles.com/ugd/6da380_abadf2fada2b44e5a454dacfffc36827.pdf
    • https://static.usrfiles.com/ugd/87fdc7_db3ae48cd78f4942b8003774cdd52803.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5da69e4631440b58f7fcf8c8e94b7ee.pdf
    • https://static.usrfiles.com/ugd/289c5e_fa25937c2d664160b0d506018ffab77a.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_off00007205.bin
356c3d8cba6865851f59106d5d871e5c6472e3e14ea5f4464a96e97f7686c88f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7205 5188 bytes
font_01_sfnt_off000083b4.bin
b47131c75218b76d611fb2c2408ec215f4ceacff01a09112cc45d8dbd3b94658
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B4 10992 bytes