Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3b38b070efe9eb…

MALICIOUS

PDF

49.6 KB Created: 2020-08-31 15:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94daf11bb6fb6052be1671cf2b47f7c0 SHA-1: c14a74a420aae8e57ecbd19f7b360b57607dfc3c SHA-256: 5b3b38b070efe9ebb41e37778e24c4eb0720b6a866602926616e3aaedaacb8d6
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous external links, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting a link farm designed to direct users to potentially harmful content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

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.com/wix?keyword=assumptions+in+research+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/33c377_7061cdd377ad4fdd8f3cbba761daf310.pdf
    • https://static.usrfiles.com/ugd/34ec99_620f85aa13cf4960bdda3d20ecbfba82.pdf
    • https://static.usrfiles.com/ugd/b5aed9_cb582d4981904995985cf28e10ce302b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f601a48014ad4ce6a86afe8b1550cd5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1285a1d03aaa434186f99d8ee747aa87.pdf
    • https://static.usrfiles.com/ugd/b8c837_22753cedaa424edbbe5fa513a506f6e2.pdf
    • https://static.usrfiles.com/ugd/804ff6_4d562d8914784726b2aae1a74afb240d.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/credit_analysis_course.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/lspdfr_coastal_callouts_download.pdf
    • https://static.usrfiles.com/ugd/0779a3_67e9a1d168014fbc937b6778a129da08.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2922f2e2c864870b739e3a005f8cb08.pdf
    • https://static.usrfiles.com/ugd/1a89c8_43fc6f828ed34ae78ebf74f59649938d.pdf
    • https://static.usrfiles.com/ugd/902d29_8cafd285bc244da9a4598a31be6f9b32.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_off00007426.bin
edc2933257b1fbf82003f546feef68a67e4f7c321753a1842008e624e5670700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7426 5236 bytes
font_01_sfnt_off000085bc.bin
1239fb61c8af738be241a7cf2ea8f052d9a74c601f4fa5a2ad47533e9bce7b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BC 10540 bytes
font_02_sfnt_off0000a9c2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C2 4324 bytes

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