Malicious PDF — malware analysis report

Static analysis result for SHA-256 14437510a8624638…

MALICIOUS

PDF

41.8 KB Created: 2020-09-03 07:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3540c03a2411029dfd3e1fe94685503b SHA-1: 972f0a11f9c10e66b3d628f9080dd5ec306442a1 SHA-256: 14437510a8624638a342acecaf056f291365abd687108c174ea145ab9d8f0918
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to external PDF files. One of the primary links, 'https://ttraff.com/wix?keyword=ansioliticos+naturais+pdf', is identified as a known malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious activity appears to be the mass linking to external resources, potentially for SEO spam or to distribute further malicious content.

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.com/wix?keyword=ansioliticos+naturais+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/74414091464.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/xawonoruxuxonetagodomi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/facebook_messenger_apk_latest_version_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/67787616696.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/38045333345.pdf
    • https://static.usrfiles.com/ugd/ecd213_460d2f5c6c3c4579941fc034b2c8fb62.pdf
    • https://static.usrfiles.com/ugd/d017d5_b0aceafa227547ccb45f8f9cc7fbfcd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e91c8ffad224240b9b6ae6b2fc36491.pdf
    • https://static.usrfiles.com/ugd/b8c837_a86d8827fcc54690a3be15e679b07105.pdf
    • https://static.usrfiles.com/ugd/738632_5bf5a8354abd4d32a06ec561e760335c.pdf
    • https://static.usrfiles.com/ugd/c3548c_d79b852c49a8496fb8c01ba233e8bd65.pdf
    • https://cdn.shopify.com/s/files/1/0459/5502/3007/files/85555932123.pdf
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/suwoxed.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/cylinder_smc.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/arte_contemporaneo_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/pagiwixow.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_off0000675b.bin
2e496b44ad853ab5d5b787a965940672b47430ed5e8ef7323bc0d4f4bf0f9b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 5140 bytes
font_01_sfnt_off000078ea.bin
2cba3d48ff5ad78c0bde46d69bf617526b9cbfea366de954ffe7391936693627		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EA 9792 bytes

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