Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6b24cedaf0e796…

MALICIOUS

PDF

52.3 KB Created: 2020-10-15 08:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 98c22efcb43efa73a3a9cab91529f23b SHA-1: e0da7a9c0164ceba277b959f9d4d99d5328c2399 SHA-256: 5a6b24cedaf0e7962b250f5d51050bdd0586b859fb3f15b9b27adbaf47bc77f6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://cctraff.ru/strik?keyword=best+android+media+player+library, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent.

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://cctraff.ru/strik?keyword=best+android+media+player+library In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f87c4fe5d1cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f8733eb3ef60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f87847db738f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87321778c9d.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/semoze-juzelorari.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/domujofurebaxis.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/5b7925e0f2c.pdfIn PDF document text
    • https://site-1042598.mozfiles.com/files/1042598/29301357019.pdfIn PDF document text
    • https://site-1040277.mozfiles.com/files/1040277/harbor_freight_electric_pressure_washer_manual.pdfIn PDF document text
    • https://site-1044209.mozfiles.com/files/1044209/23121667931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f87751d0f8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f87c545d8b4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f87c7a11f4ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f876b317804c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f87880326112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f87c694c0c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8752e234470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f878eb4e79cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f87d9c029e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f87c090e7aa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f86ffc1d1643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f87bf3a89cc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EC 5184 bytes
SHA-256: 2b245af7ccb07f90063395240c5270d703e0ad99cb96fc259d501d67b44dcdfc
font_01_sfnt_off0000926a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x926A 10196 bytes
SHA-256: a316b0be80724d062b177af32e616dfd9f41edab6126171efd2876a22a9caac7
font_02_sfnt_off0000b562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB562 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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