Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab2082cab67174a…

MALICIOUS

PDF

65.8 KB Created: 2020-11-20 08:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87b864db54f62c444cd56f1e6f515b16 SHA-1: 66d4881fab25e2d5d17ab4b4384125029573225a SHA-256: 4ab2082cab67174ad7e55c8251d3465ea1e6dd15c6f2e593331c4185a56d438b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of linking to potentially harmful or spam-related content. The ML classifier and ClamAV detection further support the malicious nature of the file, suggesting it's designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=game+killer+no+root+apk+2018+download
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f90eceda7152.pdf
    • https://cdn-cms.f-static.net/uploads/4449183/normal_5fa15e914507e.pdf
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5f94caa68f338.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ratefunerod.pdf
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5fb2d490ab033.pdf
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f9cc05185ed4.pdf
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdf
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5faa4d750508d.pdf
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f9001fbe52d1.pdf
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f95bbe7a4816.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pasawexawinogad/ben_10_ripjaws_coloring_pages.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_off0000c453.bin
3bb7ec1367988e7c952dd928dae27aed8fe05cc41008f11879fb96d1f7f242e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC453 5636 bytes
font_01_sfnt_off0000d77c.bin
470c95938fbe80fa78824b4ce8d71c868e5b32574fc04baa2003f5f65f2c5e28
pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 10304 bytes