Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a627ef24b7b63ff…

MALICIOUS

PDF

45.5 KB Created: 2020-09-09 04:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71fad9acaa32a669d4577598cd92a05a SHA-1: 2aaf9104e505f5dbbf2aa023dc09bffe63e1b56d SHA-256: 5a627ef24b7b63ff580c38ff901b52da66cb2ad1736267baf59ff92a98948559
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=login+template+bootstrap+material+design'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to benign PDF files hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=login+template+bootstrap+material+design
    • https://bbbootstrap.com/snippets/embed/login-form-material-design-icons-45864640
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/46a5ae_b8bb4fa99c03438e97fc7cbbddd2fe3e.pdf
    • https://static.usrfiles.com/ugd/fdee49_5d6e85aed7fb485993214eeab317d15a.pdf
    • https://static.usrfiles.com/ugd/3bca44_28e14ea8b8004146bffe45d1f88b6037.pdf
    • https://static.usrfiles.com/ugd/144d27_7cb10424b9fa4a409630254f124d285c.pdf
    • https://static.usrfiles.com/ugd/3fc21f_b6c6b0a7069747368030174a99f7907a.pdf
    • https://static.usrfiles.com/ugd/85d67f_8be61edbe1844907b23b1d46731533ec.pdf
    • https://static.usrfiles.com/ugd/a91264_f6d91d8347af49d1a5af43ad6e0a5679.pdf
    • https://cdn.shopify.com/s/files/1/0429/9368/0547/files/gomizinofubun.pdf
    • https://cdn.shopify.com/s/files/1/0456/5270/5447/files/angular_material_card_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/0598/2366/files/9424722260.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46456123156.pdf
    • https://static.usrfiles.com/ugd/53c654_39306327dce14b5c81c97c6a44311d84.pdf
    • https://static.usrfiles.com/ugd/66c878_193c7d2ab6a949748e4b937ee57febc7.pdf
    • https://static.usrfiles.com/ugd/cc3ca9_d218a07f3d304d3b9fb2ed4146d8afae.pdf
    • https://static.usrfiles.com/ugd/c1de29_38eef3cbd0f145fc9189d91a32a43b9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f97fa90c669740a3bcc3e42ca525cfbf.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_off000063a7.bin
1f3cf68ec184b838e10d7809b3ee1201b3a1925f9bef22a64f02d20892512267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 5360 bytes
font_01_sfnt_off000075c2.bin
7a3e2ae51a1d2752d4cbbe39641723581c5fe36d8154a338a595564d8a40653d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C2 16024 bytes

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