Malicious PDF — malware analysis report

Static analysis result for SHA-256 52242bc9133f6946…

MALICIOUS

PDF

64.3 KB Created: 2020-12-15 08:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1c979f7dfa441540bc032997e5c5e3a8 SHA-1: 7b10add3244d70c32b48f72fe48b27ba3a6ba4ed SHA-256: 52242bc9133f69460842a527f8af4f23b2e5217fc8551096ea66fc2f2d012aeb
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, forming a link farm, with the primary malicious URL being https://cctraff.ru/123?utm_term=watch+your+name+english+dub. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=watch+your+name+english+dub In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_5f9ffcda97f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_5fc0cb4be7219.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/tevuwewogoka-fomikopomeg-nuximowa-zovavanivazibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5f9f440e9bdf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5fcf0e5b89c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f87567468633.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/c9bae572-6f55-4f38-960e-e3aaabd6630b/swtor_marksman_pvp_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25695a4b-e186-4794-ba82-9d73f3f57d57/sejilasexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf94a01-b200-4e7a-92a9-c63fbe53301c/falepulevone.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/shareit_app_new_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/359569a3-d1c0-4d19-9b0f-3990f7765b4f/xagiwezig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0205e6e4-1a7b-4231-8caa-28cc1f829001/sanyo_dvw_6100_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/adjective_practice_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d081243-ea2d-4318-9fd7-4b92c2228683/77263317382.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 3936 bytes
SHA-256: e3a1f699005da9f807bb4c5b5c551b36de70a2b989a6c38433b65fc3bff0c0dc
font_01_sfnt_off0000be24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE24 5608 bytes
SHA-256: d4bdf236b4f6b77cfdb968c6a6998b7c4188bd3fa4ae7a360e83d22cf575efa0
font_02_sfnt_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 10324 bytes
SHA-256: f40156d7b95dc20e23880533fab48d36504e6575068ce47674e0493d467d6dcb

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