Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8663025770f197c…

MALICIOUS

PDF

72.7 KB Created: 2021-01-13 02:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 67e09e50f7a84b8ac3149f41d33c3d0d SHA-1: d3f4f0aa60dfb6ad613f9516e58fe697d7463568 SHA-256: d8663025770f197c0fd26a488bef95e6c64f76279ba7409bda452ad76203f52a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'cctraff.ru', which is also listed as an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains references to 'secret calculator app for android', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=secret+calculator+app+for+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f874fa52cf34.pdfIn PDF document text
    • https://site-1201629.mozfiles.com/files/1201629/name_generator_for_games_free_fire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5fa40d163c70e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447089/normal_5feb63aed672b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5fb2bfab84fbc.pdfIn PDF document text
    • https://site-1227526.mozfiles.com/files/1227526/inequality_review_worksheet_algebra_1.pdfIn PDF document text
    • https://site-1177636.mozfiles.com/files/1177636/wewemozeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f8dfbcbb8e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_5fa0eda84b1e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/40126035658.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/nobaxek.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/87104592366.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/openbve_mta_trains_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 5072 bytes
SHA-256: 8a3d13d0471cc463e359cbfbcc3a279479919ee1fd3dccdfb0d8b17fa81e1409
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 10772 bytes
SHA-256: edfbe8805d86adc852e2f13e40faadbb01e52c92982fbd7d3f218b0d9c447165

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