Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f38f999eb3fdff9…

MALICIOUS

PDF

52.7 KB Created: 2020-11-05 22:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 373840367c1eee6c0a77d85864814203 SHA-1: 9ac3e0104daa9ccfa73e8c45a519258b16979578 SHA-256: 6f38f999eb3fdff9cb043be59a16abe1646f279062518e828d6388667b4a3a3b
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/123?keyword=candida+crusher+pdf'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL within the document body strongly suggests a phishing or malware delivery attempt, likely initiated via spearphishing.

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/123?keyword=candida+crusher+pdf
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5f96bc790173a.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f91298f90f0b.pdf
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f9f9fdd338b8.pdf
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f98c9d08f8a5.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdf
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/6a3e1d716.pdf
    • https://cdn-cms.f-static.net/uploads/4386622/normal_5f98cc518b786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3009/1688/files/uhm_class_availability_summer_2019.pdf
    • https://s3.amazonaws.com/sugaguxagu/wefibekelalinikokotijukan.pdf
    • https://uploads.strikinglycdn.com/files/537eb72c-fdfa-449c-b0c3-be07c9797024/what_is_pellon.pdf
    • https://s3.amazonaws.com/wibedubosateg/70568829138.pdf
    • https://s3.amazonaws.com/henghuili-files/tegurekividewito.pdf
    • https://s3.amazonaws.com/putelekireza/autoria_y_participacion.pdf
    • https://s3.amazonaws.com/wulotugadag/what_does_rd_mean_in_texting.pdf
    • https://uploads.strikinglycdn.com/files/95dc02ba-6278-4552-ad6e-e7028b01819a/22214700531.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_off00008f9f.bin
bfc7f3add80c5f347df5ba52eb502298d7a5ae5020d86fefb6eede3c02ea627b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9F 5116 bytes
font_01_sfnt_off0000a0fe.bin
8eb00ef32711f8fc154774919968dbc4da73689a114dc4e6d8487d8a1678b10a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0FE 10848 bytes

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