Malicious PDF — malware analysis report

Static analysis result for SHA-256 868434e0d7b376ef…

MALICIOUS

PDF

65.3 KB Created: 2020-11-01 08:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbb112c09d7e094c9e2bc7f8479b191c SHA-1: 935aa9f159293828762709973e2a87863df7886b SHA-256: 868434e0d7b376ef65c23c0621d3158d4e8e3edcb355bb80e3266bc018dc6ef2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is 'https://cctraff.ru/strik?keyword=marijuana+laws+by+state+norml', which is likely used to redirect users to further malicious content.

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/strik?keyword=marijuana+laws+by+state+norml
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f8767da11471.pdf
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f9347515f637.pdf
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f906ae4d494c.pdf
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f94bb2f1db0d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dujepav/855050120.pdf
    • https://s3.amazonaws.com/tadovu/construction_company_introduction_letter.pdf
    • https://cdn.shopify.com/s/files/1/0504/3794/7581/files/flaming_gorge_fishing_company.pdf
    • https://uploads.strikinglycdn.com/files/0f2c8bde-77f2-4619-91b7-1b8bbf481e67/47999392290.pdf
    • https://uploads.strikinglycdn.com/files/266a28b2-86d4-464a-9228-20437a156e40/84452812592.pdf
    • https://s3.amazonaws.com/badodemebo/basics_of_electrical_engineering_ktu.pdf
    • https://uploads.strikinglycdn.com/files/89bbf729-f04e-438d-a82c-f3529a904031/peseporasadukiw.pdf
    • https://uploads.strikinglycdn.com/files/01d2af59-5cfb-4df8-8f1c-e1efafb87cb7/natural_remedies_for_ovarian_cysts_that_actually_work.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_off0000bfda.bin
a8e4bf24d82f0e7376729a0b8ead48dfceb20963c6dd6877db117987fa64f776
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 5244 bytes
font_01_sfnt_off0000d1bc.bin
7098f670a85571a22f4c207ccc5d4991a825800019be7f6e6545a1f5f6115b74
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 11288 bytes