Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e43ec397ee56cb1…

MALICIOUS

PDF

45.5 KB Created: 2020-08-08 02:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7956db7fb7269e3b62506107853f93b SHA-1: fbc3a0219c02bb917607f2d55e31ad6134de5907 SHA-256: 6e43ec397ee56cb15c2660ef9b6cc1750ef6ec3b6726e13b05702ef3422275e9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=metric+conversion+worksheet+pdf'. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to potentially harmful content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support the malicious verdict.

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/pify?keyword=metric+conversion+worksheet+pdf
    • http://files.ashleescreativeartsacademy.com/uploads/1/3/1/8/131871433/zukatavifabexi.pdf
    • http://files.mentalhealthjunkie.com/uploads/1/3/1/4/131407183/670c2.pdf
    • http://files.njjba.com/uploads/1/3/1/4/131453402/8b056c212422e.pdf
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0004/4440/files/tutorial_dashboard_excel.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/nafatolin.pdf
    • https://cdn.shopify.com/s/files/1/0439/2127/7096/files/honda_small_engine_repair.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2186/files/35588555565.pdf
    • https://cdn.shopify.com/s/files/1/0430/7343/7847/files/cholesterol_synthesis_steps.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/91661304409.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/72403813341.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/35820071101.pdf
    • https://cdn.shopify.com/s/files/1/0435/1534/7103/files/32974339485.pdf
    • https://cdn.shopify.com/s/files/1/0433/4069/3662/files/m4a_to_m4r.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/wekikaraguxubus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4863/9391/files/inovao_acadmica_e_aprendizagem_ativa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/sizibofumusevumevonapeso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006691.bin
03acc35d3c8f39d0eab49cb1cd774cbb7cb0f97b2bc0f432bc40849c7110dd50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6691 5012 bytes
font_01_sfnt_off000077b2.bin
2ebe4a8b658500af901cdb4bb0819b3ce700e7aff196e7bc87384287dbf50470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B2 10132 bytes
font_02_sfnt_off00009a69.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A69 4324 bytes

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