Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5d27b1779830db…

MALICIOUS

PDF

44.9 KB Created: 2020-09-17 09:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f634b855b3c9ad3b2942c0a97c8d8b4e SHA-1: 307d367bb1b763f21606e259584000411a5003ad SHA-256: ef5d27b1779830dbf2048b991a8f8c88d441f81ddf8845cc73bb0694d41371c6
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.club/wix?keyword=compound+interest+worksheet+pdf+answers', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to malicious infrastructure under the guise of providing a worksheet.

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.club/wix?keyword=compound+interest+worksheet+pdf+answers
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdf
    • http://ripovud.timsguitar.net/uploads/1/3/1/3/131378898/gamus-sedexopusomuzap.pdf
    • http://files.sisterjane.org/uploads/1/3/2/7/132740329/bemapojemagato_tisenerifevibug.pdf
    • http://files.tylerlakect.com/uploads/1/3/2/6/132695405/viluk_botiteberevaz.pdf
    • http://simavi.levelnegotiations.com/uploads/1/3/0/7/130775209/lexefipezodaramezak.pdf
    • https://1f4a6e23-c4d4-49d7-aec0-cb447652fdc9.filesusr.com/ugd/0b46e6_57bbc22325104d4ba0f90689e7406d05.pdf?index=true
    • https://f22f7d77-9a4c-445e-af12-5d9ab7d7e289.filesusr.com/ugd/3bf302_a670cc47c7ce4e1283ea3b3e77c7eeba.pdf?index=true
    • https://22bc3960-00bc-4bc2-ae4d-b4f842cbd2da.filesusr.com/ugd/55cc32_6baa4b5512a14124bd79dd31664201d9.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0455/4273/6037/files/keto_diet_menu_free.pdf
    • https://cdn.shopify.com/s/files/1/0464/9359/7848/files/borislav_stankovic_necista_krv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/learn_german_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4495/files/black_s_law_dictionary_10th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6256/files/xodololenaru.pdf
    • https://ec2274c4-9a54-4b1e-ba99-be77e4bfc7ab.filesusr.com/ugd/cdfdba_fa96eb1890be481ea1bcc689ee935033.pdf?index=true
    • https://21897904-5f9b-4b64-9972-2a08c2300288.filesusr.com/ugd/0286dd_8b8f578a645642f8b3ab1cce92717bf8.pdf?index=true
    • 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_off00006ff5.bin
ded1080dd6769aec68a11014bdc22fad1b71981720125dcff14e2922109ea26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF5 5308 bytes
font_01_sfnt_off000081ea.bin
f3fa1ffa5ed74fe297b4dfd7bedac614ac7b1b0e660f93b2b52ce1e8a7bb9cad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EA 10852 bytes

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