Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0987c5f74ce8bb0…

MALICIOUS

PDF

41.7 KB Created: 2020-11-04 19:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c14b53c7a7ea50336ba00c00b78aea76 SHA-1: b916f45c2c3c3792d62140ac5070d2a4506e7b5d SHA-256: c0987c5f74ce8bb026ee39bbcb288f802117216403ce7b0e6ceb5a201c33ce15
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the presence of a browser installation lure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to attract search engine traffic and redirect users. No scripts were extracted from this sample, but the embedded URLs and redirector link suggest a social engineering attack aimed at delivering a payload or leading the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/123?keyword=pearson+interactive+science+grade+6+ohio In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f87760920055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5f97b0af2fc95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_5f95dbefebb3d.pdfIn PDF document text
    • https://xazotanosiwe.weebly.com/uploads/1/3/4/3/134314219/ragituzuz-gutobajiguzox.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/210815b6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f8f1bf94bcb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5f987e91272ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5f8eb0db3f045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f8b294b2707d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5fa2c3faa6a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5f98d15fc4b5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/jawilavojir.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E3 5384 bytes
SHA-256: 2a8a17dfb394af61460b66fd1b76a411eca97da0d798b186b5b4689f9312a210
font_01_sfnt_off00007534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7534 10864 bytes
SHA-256: d6c7f85e993969dde8f722f732567eeca20863402d393372ce59101100df0588

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