Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57851656ff1289d…

MALICIOUS

PDF

39.3 KB Created: 2020-08-14 07:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e46279dc410831049b8a25662d3db6e3 SHA-1: 05d83b1fe0425dc2803f9477c2d275f0608546e3 SHA-256: e57851656ff1289dd3d9baa0643c69de39c674c0bdcc71ddcbc34fbc7af78c91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL to the malicious redirector. This suggests the primary goal is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=pdf%20compress%20online%20less%20than%20200%20kb
    • http://files.forestburgbaptist.org/uploads/1/3/0/9/130969920/rexurino.pdf
    • http://files.thinnerstrongerhappier.com/uploads/1/3/1/3/131379060/9111059.pdf
    • http://files.team-griffin.net/uploads/1/3/1/3/131379894/f304b.pdf
    • http://files.thechristianrepository.com/uploads/1/3/0/7/130776239/lululi_vupasililudej_rakuz_lojeduz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9352/4634/files/arreter_de_fumer_allen_carr.pdf
    • https://cdn.shopify.com/s/files/1/0428/1466/8959/files/aktivistische_investoren.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/mojefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/zuwevibavevone.pdf
    • https://cdn.shopify.com/s/files/1/0440/5759/1960/files/73682853257.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/3994/files/22346605136.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/85866899344.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/libro_materiales_compuestos.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/23120083068.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/95636837719.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/return_address_label_template_pages.pdf
    • https://cdn.shopify.com/s/files/1/0441/3197/5320/files/sufowudaguzataj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.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_off000059c7.bin
1eb4c918ff8674a2e2ab7057ceb742a0f7076fe438539a60bc480c6662acfd8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C7 5876 bytes
font_01_sfnt_off00006d92.bin
165d73fc286c8ab139505058d20f666c980651e11b56e46694d1d58701f14317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D92 10200 bytes

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