Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b25fcf75f29362…

MALICIOUS

PDF

66.8 KB Created: 2020-08-30 18:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c2a2a88678d22fbc65224f162c8c16d SHA-1: db1792e6d081a627de9434f0e60039f6baaa3960 SHA-256: 72b25fcf75f29362a31511bd6f9638b9c94b93c3f5bb8f4282666a01e16972ef
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL and a keyword suggesting a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links further supports a link farm or redirection tactic.

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=narrow+definition+of+forensic+psycho
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a31856_6ad5ef7a7d2046d48d2976b411462e4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cd6842a3f7347c39226023b7cdfbb40.pdf
    • https://static.usrfiles.com/ugd/b85eb0_8e3237aad0ba4c0e9d979b09263a9bf5.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/android_studio_install_color_theme.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/farm_and_workshop_welding.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/cambridge_fce_listening.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e1ad306dfcd4c7594ba4964ccb577ec.pdf
    • https://static.usrfiles.com/ugd/724fb5_4962fe5fd5b94051bd8075cf47558c4b.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/fukuza.pdf
    • https://cdn.shopify.com/s/files/1/0440/5523/2677/files/august_month_current_affairs_vision_ias.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/adobe_acrobat_writer_free_download_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6594/files/adulthood_is_a_myth_sarah_andersen.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_off0000c88c.bin
79b5f9f59df8167ae600c13dd43d78bcc26b36434e8ded7f95548029940e7bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 5376 bytes
font_01_sfnt_off0000daef.bin
85a48f4334eeecfd6716ecd3954cd748b343a601c338536d7c7a99077157afb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 10392 bytes