Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a34dd67f31182c…

MALICIOUS

PDF

58.1 KB Created: 2020-11-08 14:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0ad7234615059dcfa4b86bdf3aa056f SHA-1: da3de1161658cc0f0c2e5d923d439d469447c0e6 SHA-256: a0a34dd67f31182cdb1593684acd267ecfce218251704ab95b1bb399bb572b93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also listed as a heuristic firing. This suggests the primary goal is to redirect users to malicious sites, likely for further exploitation or phishing.

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://gettraff.ru/aws?keyword=bronze+dragonborn+dnd
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5f9e37db60d8f.pdf
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f91737841940.pdf
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5f9bc6280474e.pdf
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f8b9f9409deb.pdf
    • https://cdn-cms.f-static.net/uploads/4452607/normal_5fa7290ac1aa4.pdf
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f8f3d7dbaed1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0667ddb0-78d2-470d-b11c-f69a06246772/usmle_world_questions_free_download.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/crossroads_baptist_church_va_kenny_baldwin.pdf
    • https://kopenufib.files.wordpress.com/2020/11/nujipogezade.pdf
    • https://s3.amazonaws.com/dutuzanob/multiplicative_comparison_worksheet_grade_4.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_off0000a62c.bin
20355c321d3e42c5f22e1b8c0495af8abfe060a6a13b812ee859a3df509b6e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA62C 5024 bytes
font_01_sfnt_off0000b756.bin
54f943b84d39909b14001bfe400fd2b1e1d9a640e9f2b4f48ae54acf9948e2ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB756 10832 bytes

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