Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d96b2adb8060a9…

MALICIOUS

PDF

39.5 KB Created: 2020-09-01 02:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7baa9ac088bb4cf972e7876759bc2734 SHA-1: 3a5e0e598f402a86728761d8f7c016d4ce76bbb5 SHA-256: 73d96b2adb8060a98025302ec2fdd29b1ce4ea4ef37d4c1b83976ad8e26a3491
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with at least one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites.

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=doyles+guide+barristers+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_fb7f2479483b46509ae1b8bf42284415.pdf
    • https://static.usrfiles.com/ugd/19103d_fac92c8b1d0e4bff9823d1c629a6d654.pdf
    • https://static.usrfiles.com/ugd/5ad03d_64913c45442b482596f55bf37960c6dd.pdf
    • https://static.usrfiles.com/ugd/7d21c0_5f17d110003948aebcd7558a816ea7f9.pdf
    • https://static.usrfiles.com/ugd/83d902_b38b528b76c34e5d9ee7b10626002e72.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/renesas_usb_3._0_driver.pdf
    • https://cdn.shopify.com/s/files/1/0432/1460/2401/files/examining_digit_place_value_common_core_sheets.pdf
    • https://static.usrfiles.com/ugd/b88e3d_9b707a4a7dfd420ba2a3723bc6fe7d01.pdf
    • https://static.usrfiles.com/ugd/7603ae_fa31933f3b484d4586dea4d0dfecb204.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/modal_auxiliary_verbs_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/stdin_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/41772746376.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/52287424516.pdf
    • https://cdn.shopify.com/s/files/1/0438/0318/1218/files/45000961202.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_off00005bc3.bin
6af581c31d5b75593fb664372af65058bc77853d2f4b9cb19f357f8544a7caee
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC3 5716 bytes
font_01_sfnt_off00006f48.bin
30058ffdbf00a1c76c5eebe3813cbc5933cbd3c0bdce60cdec835bdf8881d1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 9820 bytes