Malicious PDF — malware analysis report

Static analysis result for SHA-256 b418501cd90e4b33…

MALICIOUS

PDF

35.7 KB Created: 2020-11-02 23:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c412fe3ab98633667d4efe2acfb5a24 SHA-1: 512f4a4ba49623d13d0ff23ac9e901b0f0cc8fde SHA-256: b418501cd90e4b33f6802921e81b7ffd376347cf79549bfca397f42e2ac1ec4f
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary malicious redirector URL disguised with popular search terms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the URL https://ttraff.cc/123?keyword=my+hero+academia+season+4+dubbed+ep+22 leads to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded links suggest a phishing or redirection attempt.

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/123?keyword=my+hero+academia+season+4+dubbed+ep+22
    • https://cdn-cms.f-static.net/uploads/4408335/normal_5fa03d1a7215c.pdf
    • https://vejifopa.weebly.com/uploads/1/3/4/4/134461381/bdfe6b8b.pdf
    • https://tokuguzeg.weebly.com/uploads/1/3/4/4/134464653/6cfb861e.pdf
    • https://nuzopotox.weebly.com/uploads/1/3/4/4/134497293/zukovejeku_telofisodeka_kakemetovajijut.pdf
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5f9aaf16ac18d.pdf
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f91bde8ccd8d.pdf
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5f98f98292b3b.pdf
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/962127d9c5789f4.pdf
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8e11a1b094a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/56ff2310-63a8-470e-98d4-11ce10af654b/xipaj.pdf
    • https://uploads.strikinglycdn.com/files/d9eda3da-090e-444b-8879-3d53a6768f01/34589882639.pdf
    • https://uploads.strikinglycdn.com/files/eb2c53fe-94be-4df6-9ccf-8aae94dff527/clear_plastic_balls_to_fill.pdf
    • https://cdn.shopify.com/s/files/1/0498/3403/3307/files/96546831461.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_off00004cef.bin
96b033ff4846c5a43cfde431b208264738051d5f661b1b72d1a121c231a790c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CEF 5748 bytes
font_01_sfnt_off00006062.bin
c72fd0245dbd7b032a5512c7d631b92630488b313d5ecae288d6bfb52c68ad00
pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 9896 bytes