Malicious PDF — malware analysis report

Static analysis result for SHA-256 63825842b448791b…

MALICIOUS

PDF

44.1 KB Created: 2020-08-07 23:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c23d1f38f8b6e21309da1849953cd0f SHA-1: 0e328a59de1b095121f12a58dcb6b6ab5c0bbb5c SHA-256: 63825842b448791b8f07422e4a700bc046b87f63a43268abd0954c37e37f9bf0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector, which in turn points to a large collection of other PDFs hosted on Shopify. This behavior is indicative of a link farm designed to manipulate search engine results or distribute content, potentially malicious. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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/wb?keyword=la%20crosse%20technology%20weather%20station%20manual
    • http://files.biblecodesrevealed.com/uploads/1/3/2/8/132814050/lubebasu.pdf
    • http://files.giftsbygriff.com/uploads/1/3/0/8/130813768/3256590.pdf
    • http://files.northsalembands.com/uploads/1/3/1/6/131636914/2b473fa.pdf
    • http://files.abellcable.com/uploads/1/3/0/7/130740391/vubupikepita.pdf
    • http://files.raymondbassmasters.com/uploads/1/3/0/7/130775949/acac351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1841/1417/files/pedilimajafa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9067/1771/files/setting_up_local_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/editing_text_in_adobe_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/gasezuvinav.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/especialidad_alerta_roja_desarrollada.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/zutufuxozuboriwemijuzotik.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/66134520593.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vufofabiziterefabul.pdf
    • https://cdn.shopify.com/s/files/1/0435/0997/3147/files/tuvonudipunosiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/92666839261.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/vexusobisiwulipoxexamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/attestation_de_salaire_remplissable.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1534/files/92938900792.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_off00006156.bin
bae469fbf5e1cb756351895f6533fb70574b5060e98200cf42e161295c377450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6156 5348 bytes
font_01_sfnt_off00007378.bin
67cf5d7786e312cdf8aed6b7865551f796f57d30bf890cca8648f4c4accd9798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7378 15324 bytes

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