Malicious PDF — malware analysis report

Static analysis result for SHA-256 15444c5e7a236c6b…

MALICIOUS

PDF

33.0 KB Created: 2020-08-30 09:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fea5db4a3a2a774218f8f22677f10d7 SHA-1: 9deed79470d4cd2279133ea78e7c1d0840685f58 SHA-256: 15444c5e7a236c6b9994a3c462a2dea2dcac081d4001eabfeabb913bd07ee18f
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains numerous links to external PDFs, suggesting a link farm for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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.cc/wix?keyword=sherry+argov+books+free+download+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ab922d_20aa718d1c1b442eb38042cddbbe518f.pdf
    • https://static.usrfiles.com/ugd/b7ed05_bfd6ecc47c2b4632bd7a95aa9f72533b.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d77500cd1d46fa8b209575995d7c32.pdf
    • https://static.usrfiles.com/ugd/b8c837_649d9b1d00754687bfb4efdc3589a2aa.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_0c3eab62e2fe45aaa9c248319f8bd529.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/xujukega.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/buresemanuzodusegojoja.pdf
    • https://static.usrfiles.com/ugd/d54300_c81538d2c698424593c771a199d9b984.pdf
    • https://static.usrfiles.com/ugd/b8c837_c575e52dff6f467181dd5c68f6159dc2.pdf
    • https://static.usrfiles.com/ugd/c1de29_9e66388ba3d749f0b0ce8c0b1b100b9a.pdf
    • https://static.usrfiles.com/ugd/f55bec_55cd01e463114dcbb4fd63b73d545d16.pdf
    • https://static.usrfiles.com/ugd/b8c837_0160fc993db34c7eb2f1e115e230068b.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_off000043d8.bin
84713e6db9fa8d8ae9a31322c850669289f7f322ea93074cef95a1e18176bded
pdf-font-stream PDF embedded font (sfnt) at offset 0x43D8 5864 bytes
font_01_sfnt_off000057dc.bin
c058499ab690c0a597620ab3548ece3405e98a49508da7bd2437438e97e75b96
pdf-font-stream PDF embedded font (sfnt) at offset 0x57DC 9240 bytes