Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb14fb6748cc75ad…

MALICIOUS

PDF

77.4 KB Created: 2020-08-04 01:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c7bc1da8a5c0b987a57a4f5ddb47252 SHA-1: 33fcb89f2f28e04d5d528b43a41ad5b5a8e76a4c SHA-256: eb14fb6748cc75ad526a28f82fb58d1a9f52667dbb5f30f0c1e6d5651f87ecf5
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for a book. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains the malicious URL, suggesting a social engineering lure.

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=adventures+of+huckleberry+finn+by+mark+twain+pdf
    • http://files.negsbestthing.com/uploads/1/3/2/8/132815961/riwemuto.pdf
    • http://files.leximayde.com/uploads/1/3/2/7/132740845/xumilivalosoze.pdf
    • http://files.cresswellpaints.com/uploads/1/3/0/7/130739628/f36856ac.pdf
    • http://files.g-p-i-s.com/uploads/1/3/1/6/131637853/4221499.pdf
    • http://files.flymusic.studio/uploads/1/3/1/0/131069987/1460002.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/5288361827.pdf
    • https://cdn.shopify.com/s/files/1/0436/7056/9113/files/ragaxulabiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/3052/5590/files/types_of_arrhythmias_ecg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/74738398927.pdf
    • https://cdn.shopify.com/s/files/1/0434/0206/8122/files/20945931521.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/giwavagekiroluli.pdf
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/detitulajidow.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/riwujerozurajiku.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/24231460460.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nidosavexurirevinuno.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/78996470310.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/natapejagawevopu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e058.bin
d78166bfbe0c42dfe3cf886c5f28e1dab4ae7f7abbb20a5a6ee33390d480f9c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 4420 bytes
font_01_sfnt_off0000eff3.bin
ad4a8df08bfa02153514c88031e788676a3ccb3c40c1f9c13ac3bdc97df21c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 5840 bytes
font_02_sfnt_off000103c0.bin
e2374ff48fa878e67c1c9dc4f1ce4546567a036a4cf5b689e142d2965d970f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 10500 bytes

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