Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3b9ddf7bcb6ea2…

MALICIOUS

PDF

62.8 KB Created: 2020-11-11 02:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc54c444e7621ad0c3028f8724d8b7d4 SHA-1: 6d7466dbd6f951737e80b6cb6172a27d06175d7d SHA-256: 8e3b9ddf7bcb6ea262e6052bba2779cdc78351ec64b9f57258dff342df37a654
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL identified is 'https://cctraff.ru/123?keyword=thigh+holster+bag+women', which likely serves as a redirector to further malicious content. The presence of numerous external PDF links, such as 'https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/1399207.pdf', suggests an attempt to manipulate search engine results or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?keyword=thigh+holster+bag+women
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/1399207.pdf
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f95d0145cd0a.pdf
    • https://cdn-cms.f-static.net/uploads/4447093/normal_5f9eed2259aaf.pdf
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5f8b9f5012188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/31e7d71c-9f1b-4658-a03d-5339ee6323a4/41710726645.pdf
    • https://uploads.strikinglycdn.com/files/476b5bab-f10c-4351-90ff-e2f22a0df5fd/59260973702.pdf
    • https://uploads.strikinglycdn.com/files/40a47940-7c0d-4a86-aa21-b00448ed9942/63971766871.pdf
    • https://uploads.strikinglycdn.com/files/8e18a048-8cb8-4bc2-a39c-3132b145de77/edit_apps_free_apk.pdf
    • https://uploads.strikinglycdn.com/files/10df5eb8-7e51-4c85-bd4f-8b20e97cf0cf/91965368758.pdf
    • https://uploads.strikinglycdn.com/files/5973929a-b2a8-44dd-abdf-ae856d8c9668/ashley_furniture_outlet_myrtle_beach_sc.pdf
    • https://uploads.strikinglycdn.com/files/82b64c50-bda8-4c76-ac3f-290c8dff6148/8361538047.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_off0000bab5.bin
007947d59fa40829daf28a46bc27caafcbf6620edf0d9d718a8292198f3f042d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 5280 bytes
font_01_sfnt_off0000cc94.bin
250e0b26c31bbcfc65b8b77b63abc3188ad0ca36f7218c33fd96a440dfcfe411		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 10212 bytes

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