Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5023bb4415e39b…

MALICIOUS

PDF

35.8 KB Created: 2020-11-02 22:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27477455173e0c3ba5a060c99582326a SHA-1: d45048d24185dd50dd305aa73b92363eb3b14f81 SHA-256: de5023bb4415e39b09a97ad94a869a0bfa6ba6a3337f0cc54e05ff1d841491a9
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a harmful site. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or malware distribution attempt.

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://ttraff.cc/123?keyword=kolpin+gun+boot+iv+loop+bracket+-+20032
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f8f774095242.pdf
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5f9df98c88257.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/nimexakexemu.pdf
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5f98904e1aac0.pdf
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5f9165df43eb1.pdf
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f97826d59bf3.pdf
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5f8da0819448b.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f9cf1b91e8bb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/731227d6-f267-4fd2-87d8-685db2c6880d/tenoxajegopanaperif.pdf
    • https://uploads.strikinglycdn.com/files/dc8e2355-5aba-41be-a97f-e6cbd0d55b8e/pokemon_alpha_sapphire_gba_download_android.pdf
    • https://uploads.strikinglycdn.com/files/a2ab9c4f-b70f-41bf-aa0c-fb2271c9c23b/xuvefuvukew.pdf
    • https://uploads.strikinglycdn.com/files/fb1f1205-2f5f-43b2-9a9e-746714103b86/88356051439.pdf
    • https://uploads.strikinglycdn.com/files/36ba2dbc-21ee-4e14-9972-1f1cbaf14ec7/bipetumomugiruzijiwito.pdf
    • https://uploads.strikinglycdn.com/files/46d3c2e4-fa08-4331-aa05-424c871f7d17/87347887832.pdf
    • https://uploads.strikinglycdn.com/files/3c6dbd33-5290-47df-b6d3-1d0b7e6e7da2/xatijolenonozarelil.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_off00004d4b.bin
0fe6e6f6476868df7144e71ce8da2ffab21e2528e682fd1521a352a2faee18b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4B 5624 bytes
font_01_sfnt_off00006090.bin
5fad4a60950ff83f3edea16d066c30ba51c3c3dea71a1fff3e9cbbd8106059c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6090 9820 bytes

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