Malicious PDF — malware analysis report

Static analysis result for SHA-256 559b225f739f6250…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 05:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4bfd6edade517fe12b89b39567e20b7 SHA-1: d7abd7c895f700ddd67b972ba6497e44265f48b1 SHA-256: 559b225f739f625006d0b82d5293dc93e3a4a641190b7c3a7286ed1966768007
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm pointing to numerous external PDFs, with one URL identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The embedded links likely serve to direct users to malicious sites, potentially for phishing or malware distribution.

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=anestesicos+locales+ppt
    • https://cdn.shopify.com/s/files/1/0466/7952/3493/files/30_day_notice_template_for_tenant.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/51661289644.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/nitafenudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/15243707800.pdf
    • https://static.usrfiles.com/ugd/accd1f_bf7bb180d89345c7b111379fccd632d0.pdf
    • https://static.usrfiles.com/ugd/cafc24_b8fd220437904f7382ddfdbb8ac9c475.pdf
    • https://static.usrfiles.com/ugd/d775a9_0e761c56abdf438cbd324b26b402a6be.pdf
    • https://static.usrfiles.com/ugd/f09a9d_345a791cb45044e6ab3f90e66b5d2ace.pdf
    • https://static.usrfiles.com/ugd/3bf302_f03ccd2b5e354943a4ec30aee6368819.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c22cce53d44ffab0fb13b1d5cecbab.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ecd.bin
3f6d74685d37c11566152da8bc8a9cbc04901185ed1efdb1ca10447f34eae18c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 4820 bytes
font_01_sfnt_off00006f3d.bin
7bb95cb66a78c961018075fbe19609da04a2b341e335c1f05957e7020db5542f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3D 11960 bytes

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