Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1b9dd301fa2390…

MALICIOUS

PDF

61.2 KB Created: 2020-08-10 06:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1088b898d275182da9378e4b4a2da776 SHA-1: 943b73139db47f1c19d5c23ab0f842451468fdcf SHA-256: 8b1b9dd301fa2390dc25421b448eb7a8d9170af2c0ca89a18a0a2abf790de7e0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an 'annual report example'. The presence of a malicious redirector link indicates an attempt to lead the user to a harmful site, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=annual+report+example+pdf
    • http://files.perfectstrangersdeeppurpletribute.com/uploads/1/3/2/7/132740805/2063294.pdf
    • http://puxaz.regenerateyourauthenticnature.com/uploads/1/3/0/8/130814397/88da22143.pdf
    • http://files.malexholdings.com/uploads/1/3/0/8/130814115/1122604.pdf
    • http://sadokadi.iammengdiwang.com/uploads/1/3/1/8/131871390/3439587.pdf
    • http://files.creativescapestx.com/uploads/1/3/1/4/131455956/1624871.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/14041582569.pdf
    • https://cdn.shopify.com/s/files/1/0428/2158/3004/files/keycodes_in_unity.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/is_there_an_arrow_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/39214294711.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/angularjs_session_management.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0429/2771/8567/files/sifekekedi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/wujirazebakafumuwov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/37729179716.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/xuwokawakupugur.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/10425259706.pdf
    • https://cdn.shopify.com/s/files/1/0430/5770/9210/files/luciano_canfora_tucidide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad7b.bin
4147d8a4bcba6ff683b0a3807d0bddc5bd03e9b150180ff6ec623dd8687f5284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7B 5068 bytes
font_01_sfnt_off0000bea9.bin
fef90cdd2b1c4c85b60775f6e85e666b8ab49eacbf7c87577c8b9b4abac128a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA9 12696 bytes

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