Malicious PDF — malware analysis report

Static analysis result for SHA-256 38392d64e0703651…

MALICIOUS

PDF

43.1 KB Created: 2020-11-01 23:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 48b495f4e1ddefc7b561225dfc773f97 SHA-1: 3f5975b0a314a61c81b3c6f89d18f662c50e1abb SHA-256: 38392d64e0703651c9be0c80eba73c62a87b5e551d748ffb4f9532b8f4eb3e5d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF contains a heuristic indicating a browser installation lure, suggesting a social engineering tactic to trick users into downloading malicious software. It also links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=download+chrome+portable', which is a strong indicator of malicious intent. The ML classifier also flagged this PDF with a very high probability of being malicious.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=download+chrome+portable In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8d5490353d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f883a83c5ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f95f4b463fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_5f9c8f8940801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f899b1b25706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f905d2d1e2a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8a49607bdbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ef0d96-5ac2-4053-aca4-b698eeed9ab3/10727460004.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunoje/so_much_for_my_happy_ending_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2b65ad-022d-4e9b-8150-b4c8ed63f037/67244777238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc44cd8-f78c-43a3-a919-bf9bffbcb327/97275200223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab92e20-f655-4ea7-8aa6-e14cbbdde513/11728675415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26e76ff-6c50-4ce8-b7ca-c0c50954c110/84356448205.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABB 5368 bytes
SHA-256: 76a14eeccc0770277c73a8cd908322692c622acd4a11279d83d11ca24e379c22
font_01_sfnt_off00007cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDD 10236 bytes
SHA-256: 7e5e8a80cfaa784b69f39f05fb7f8308d97088cfaa64a9cc197a458c98915447

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