Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c571dab2875387…

MALICIOUS

PDF

44.5 KB Created: 2020-09-30 13:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd7b7d5c238991ced30f6ac6014ba4f2 SHA-1: c79d8b285182071501ba6b31f61b8ba0d5c826e8 SHA-256: 28c571dab287538714c30184a42159a7383b39d193dd135f08f354d713f42b94
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a download for an ebook. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to a second-stage payload, suggesting a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/strik?keyword=agile+project+management+with+scrum+ebook+pdf+download
    • https://site-1036956.mozfiles.com/files/1036956/22402201271.pdf
    • https://site-1036988.mozfiles.com/files/1036988/wapuxojap.pdf
    • https://site-1036960.mozfiles.com/files/1036960/28367598656.pdf
    • https://site-1037884.mozfiles.com/files/1037884/540556194.pdf
    • https://site-1036872.mozfiles.com/files/1036872/wojusulivarelav.pdf
    • https://site-1037122.mozfiles.com/files/1037122/8568788776.pdf
    • https://site-1037207.mozfiles.com/files/1037207/10000040079.pdf
    • https://site-1036800.mozfiles.com/files/1036800/tusikukaxibivafafan.pdf
    • https://site-1036885.mozfiles.com/files/1036885/badas.pdf
    • https://site-1037022.mozfiles.com/files/1037022/nurepokejimokaviwazemase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2a04cdf7-f21b-419b-a480-8d34164780a5/52722133096.pdf
    • https://uploads.strikinglycdn.com/files/7b3ca141-a775-43b3-ac15-4245b2c0cc4a/mireteresozise.pdf
    • https://uploads.strikinglycdn.com/files/4fd92fba-a8d0-4bd1-9ad5-88201acc3f36/samosugivawaligetonasuk.pdf
    • https://uploads.strikinglycdn.com/files/ab4ae65a-7fa3-4de7-ae90-5df6f30adeb2/fiwugosizuseguwuv.pdf
    • https://uploads.strikinglycdn.com/files/74551529-88d8-46b1-b021-5e9e0cf9165c/muterazadewefivosun.pdf
    • https://uploads.strikinglycdn.com/files/6d640f83-8233-4a00-a74e-04cd094447e5/5152535568.pdf
    • https://uploads.strikinglycdn.com/files/5a1d9f8b-b343-47a2-8342-11ad13d61b2e/74042513834.pdf
    • https://uploads.strikinglycdn.com/files/bea35f5e-5837-4130-832e-9e211429957c/93287530798.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ff4.bin
2bc025cda4e3bbbeabb16d5c953e8895aa0ba99ea7d128b92cd4626c34bd21b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF4 5812 bytes
font_01_sfnt_off00007396.bin
fe6544f2478a74ba02709a569aaceed14f9c7c8e388fd347cfe6fc99aca907ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7396 10208 bytes
font_02_sfnt_off0000967c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x967C 4324 bytes