Malicious PDF — malware analysis report

Static analysis result for SHA-256 286909e6baefe71c…

MALICIOUS

PDF

34.7 KB Created: 2020-11-04 17:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5713f5d487577f8743ba8301875365f3 SHA-1: 76bfc374580d3bcd9395bf7f6d8f521ae0598a12 SHA-256: 286909e6baefe71cc29790995e765fb2185688853013442934856d31c6292de0
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body and embedded links suggest a lure to a link farm, likely intended to lead users to further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/123?keyword=hr+block+promo+code+2020
    • https://rajukoxo.weebly.com/uploads/1/3/4/5/134508115/68d6f15fa1cd1fd.pdf
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/2018885.pdf
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5f97d04212dfa.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdf
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f9fe5c9de968.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5513eafd-224a-47fd-8e52-7a0772aca454/balloon_defense_4.pdf
    • https://s3.amazonaws.com/sinadi/2699233263.pdf
    • https://uploads.strikinglycdn.com/files/324c5f5d-d7c1-454c-ad27-3c6353b385cd/65892057089.pdf
    • https://uploads.strikinglycdn.com/files/cbcc3c3a-507a-4cf6-a035-9db15bba0e4f/business_statistics_for_contemporary_decision_making.pdf
    • https://uploads.strikinglycdn.com/files/f41a56d5-f560-4b47-8526-d59e534f3b8f/28950167809.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_off00004897.bin
18306459f73fd7516a28b0b83c95e0666a9e2db0df081ee5ad559e09d463da7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4897 5272 bytes
font_01_sfnt_off00005a69.bin
66aebcf8d3e222209555070755f9ef73c41ca2d1521ed0d86121494c708196cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A69 10612 bytes

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