Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94ebb5f20ef2564…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 15:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3279c2bc27e4fedcc65a60790efc57c SHA-1: 6986ec074d1264706e7a054ae58d0c6f42d08b8e SHA-256: b94ebb5f20ef2564368a2bd8e61c34d48f1563f296ee8f19405dcdf2ae310f7b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wix?keyword=national+geographic+magazine+pdf+online`. This URL is likely used to redirect users to a malicious site. The document body also contains this URL, reinforcing the social engineering attempt to trick users into clicking it. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm designed to improve SEO for 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.cc/wix?keyword=national+geographic+magazine+pdf+online
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/42125089958.pdf
    • https://cdn.shopify.com/s/files/1/0463/6632/6945/files/lemudibawunazefikinozita.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7933/files/zirurujokejedojizarunuf.pdf
    • https://static.usrfiles.com/ugd/b8c837_c26904b176ba4d1dbcdc386cbf40fb12.pdf
    • https://static.usrfiles.com/ugd/32777b_6451232c0f49439ea20788ee634ae267.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/roll_bending_machine.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9132/files/bloodlines_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0463/8405/4427/files/jowopepejenenoku.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/nibogedalaninusazomumuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/76533454578.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/inequalities_examples_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0445/6975/5812/files/94100227733.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005773.bin
2ffe658b8682c1d25b7ba3b6b0ed2cb517e7707643ba4272e98e701b085f216d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5773 5408 bytes
font_01_sfnt_off000069be.bin
4faf25bef2dc6d259f0f964ee7146efe76c871798fd212bcb46dcce62c7ceb63
pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 13460 bytes