Malicious PDF — malware analysis report

Static analysis result for SHA-256 852f14fefa92088c…

MALICIOUS

PDF

72.6 KB Created: 2020-09-02 21:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d324612f5358d200eeb59f2abad5e1a SHA-1: 700638616aa48837b05b5dda51c479bd415bf81b SHA-256: 852f14fefa92088c61cb758b821f4c15c81e38bbdbe28c7ce0b8c8f759673387
170 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with keywords related to financial statements. The heuristic PDF_SEO_LINK_FARM indicates a mass of generated PDF links, suggesting a campaign to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.link/wix?keyword=cash+flow+statement+format+in+excel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/nuboxedamuzonafozoder.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/61416436250.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2181/files/vupagexerokurefodikukas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/26828117944.pdf
    • https://static.usrfiles.com/ugd/3ed902_2fefd8d845eb453b82a33b004fa08520.pdf
    • https://static.usrfiles.com/ugd/b8c837_8afa378f9c414a4cad1c4fd2df8203d2.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_62fcc2ed3e054536bfcf9b33095895e2.pdf
    • https://static.usrfiles.com/ugd/87d215_72c3ff5f96934690b9bd6a754c20aa11.pdf
    • https://static.usrfiles.com/ugd/2f07a1_c57015112e8c431aa38a137b266b6560.pdf
    • https://static.usrfiles.com/ugd/5ecadc_49871e1c37e84fa7b9830afacd71345e.pdf
    • https://static.usrfiles.com/ugd/ad2ade_a9607216ab8649ed9d3e989198c3bff8.pdf
    • https://static.usrfiles.com/ugd/cfa91a_0c9e0b81a7d84fc68b2fd2dd48aa3f9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e60d38d172564e7582d1c6a0d27d4e02.pdf
    • https://static.usrfiles.com/ugd/b8c837_be4debfd287f44499da90eb4dd7ebe33.pdf
    • https://static.usrfiles.com/ugd/599f1c_b060107483cd4a61a2e5cfb9a70fe04f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d530.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 2828 bytes
font_01_sfnt_off0000df2b.bin
24dba7361c93b6b93195036ccb24dc04e7df6f49324580d3225e37612d438f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 5184 bytes
font_02_sfnt_off0000f0ba.bin
42cc018cba386517884576413d3b555231e3fc0e60865ad62c3599e5a4aa2cd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 10508 bytes

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