Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca27c83349914cb…

MALICIOUS

PDF

37.9 KB Created: 2020-08-10 01:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faac334e26a9610e72506183f1a1e62a SHA-1: 24c4cc1a5d40d6de09271c8f8e9c5f6851c98e91 SHA-256: 5ca27c83349914cb88afcbca6f67fe81df1b985b8a0c01ba603501ac9cc365d0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL found in the malicious redirector heuristic. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous links points to a T1566.001 (Spearphishing Attachment) attack pattern.

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.ru/pify?keyword=atkins+fisico+quimica+9+edi%25C3%25A7%25C3%25A3o+pdf
    • http://files.marengotzmann.net/uploads/1/3/0/8/130814052/3426578.pdf
    • http://files.saintgeorgeontario.org/uploads/1/3/1/4/131438098/vuworuzevuxo.pdf
    • http://files.wolfstarhealingservices.com/uploads/1/3/1/3/131384281/8909658.pdf
    • http://lerose.silvastudioart.com/uploads/1/3/1/4/131437792/wovexipag.pdf
    • http://files.georgiahistoryteacher.org/uploads/1/3/1/6/131606393/jasobezomixomawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/third_conditional_inversion_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0440/8855/7718/files/sample_swot_analysis_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/93202259791.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/luninuwewegetag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/47032057763.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/88021635479.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/6719994209.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/technical_drawing_with_engineering_graphics_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2278/files/diablo_2_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/denofosetewosebapemaju.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004df7.bin
0426c76e63a5b01cd19014151a599fda216aa9d21ef299ee9c34ab711033cc41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF7 6008 bytes
font_01_sfnt_off00006193.bin
620068c45bd7a12798fa481095f89f85010f30361127c2343afaa63060e3c2f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6193 12724 bytes

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