Malicious PDF — malware analysis report

Static analysis result for SHA-256 825d64174c9a183a…

MALICIOUS

PDF

38.8 KB Created: 2020-08-17 03:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6474d83d56f97535538feb6b175564d1 SHA-1: 7ac9be936d42bb7b9d020d7fcdb25ec67675cace SHA-256: 825d64174c9a183a7aefe41c4321146f79966abee6cf29fcfec18bb970561a0a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to obscure the final destination and potentially lead to phishing or malware. The heuristic 'PDF_SEO_LINK_FARM' indicates the document is part of a larger network of linked PDFs, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=basic+english+reading+for+beginners+pdf
    • http://tagepuvo.exconsultinggroup.com/uploads/1/3/1/0/131070711/lamarodipi.pdf
    • http://files.gettankedscuba.com/uploads/1/3/0/9/130969056/3268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/tazikixubururi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/maxovab.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/jenkins_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0451/3352/9241/files/51611124187.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/java_image_resizer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54341666742.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/pandoc_markdown_to_latex.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/how_to_use_bfgminer.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_off00005982.bin
cdefab0b9d00a8bd5762f9e506220d5584254e5fb94462c603d4172e121a7085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5982 5604 bytes
font_01_sfnt_off00006c70.bin
56f32288fe04356e91ac8c9b84ad7f1808acde8864956d9bba26640853b9fc67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C70 10120 bytes

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