Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9f5b818b29f697…

MALICIOUS

PDF

43.7 KB Created: 2020-09-02 00:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3a624cdc481bfa6fc8136ded03fcb76 SHA-1: 95e84f19ad94b867f4773152c713b312b7133cfb SHA-256: 5b9f5b818b29f6973c9f92f5457fc75ed935a5914d55849b578739dda757fefc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, including one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Acronis backup server' and a download link, suggesting a lure for users seeking software. The presence of many external PDF links, some benign and some potentially malicious, indicates a link farm designed to distribute or obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=acronis+backup+server
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/vmc_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2386/7805/files/palapun.pdf
    • https://cdn.shopify.com/s/files/1/0431/9130/4343/files/likuraximuron.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9a48cdaf0d4a12b9854da07d65e756.pdf
    • https://static.usrfiles.com/ugd/a107db_bb7f8bdab0f74a94a5a143e92e369b1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc75df98817d440eaba87af0d092cd52.pdf
    • https://static.usrfiles.com/ugd/b8c837_d480769a35384017974c1bb12043c8d9.pdf
    • https://static.usrfiles.com/ugd/d954c5_7c149dc73e6741bf8580e7c683d5da6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbecc9a1d58c46e9b45e70e6f34fd5c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f51a4045a515473d84f23bf42b5d6aa6.pdf
    • https://static.usrfiles.com/ugd/455f95_6bc153fb1d2340d3ba5cf636c45f9f0c.pdf
    • https://static.usrfiles.com/ugd/c1615c_cb34212e73d54fc5a4af7831377c19d4.pdf
    • https://static.usrfiles.com/ugd/a76634_65c79d6fb5bd4ec0a0bb4aa112ac78d0.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006da4.bin
ff02c196b792c2640ada17a0f98a0fe44af49ec981d588374fe03ac00046fc4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA4 5148 bytes
font_01_sfnt_off00007f3a.bin
a4df8c4abe2e442d443797720424e7dbb39c6b93ce503670e1a62c5b7766fdd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3A 10252 bytes

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