Malicious PDF — malware analysis report

Static analysis result for SHA-256 659a887c0f21ed4d…

MALICIOUS

PDF

46.9 KB Created: 2020-08-29 01:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 576568fab8029eef666079b4e21ac32b SHA-1: 07cac9e357ee15b3a15636397ae517359b26ffae SHA-256: 659a887c0f21ed4d9c9cd3907425372fe1e42421085a2d204569b0e400b6e2c0
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of link farming or phishing. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded links are the primary mechanism for directing users to potentially harmful content.

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=toshiba+50+fire+tv
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_acd2b21d711d485d93ff7233026187c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4a1241efb154e09aea32844d3733e53.pdf
    • https://static.usrfiles.com/ugd/b8c837_9548bc96a7074bd3b6b505c4f8f6eca4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/ges_core_maths_syllabus_for_shs.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/niwodapobafidivajilela.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/gexosipiwamigusorejege.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/nmims_hyderabad_placement_report_2019.pdf
    • https://static.usrfiles.com/ugd/b8c837_40ecab15222e4f93acc8affd824c602a.pdf
    • https://static.usrfiles.com/ugd/b8c837_681d5d5fb3eb4682a5c791d1f1f60db0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7623674079ae4d38a386c18a331a61c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ef12abd6e7b45b7a467773c1fd6f4e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e16c89ece2d441d99aa31afefa96d13.pdf
    • https://static.usrfiles.com/ugd/b8c837_20f2a63ed025432e8c3b46eb407c12ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c234ccb8ae046a4b6ef9e0a5908e981.pdf
    • https://static.usrfiles.com/ugd/b8c837_a309032ba28d4d289b36c7be125dabd7.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_off00006bb1.bin
f88df3bc681bed373f506e1d2302657d7e9685cd2231256f14e0fd250eb9e2d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB1 4920 bytes
font_01_sfnt_off00007c84.bin
2f29d04f206910338be2aab3122921a741c7e47b0306381330be739145fb593d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C84 10852 bytes
font_02_sfnt_off0000a0eb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0EB 4324 bytes

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