Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b877f55c7a6fda…

MALICIOUS

PDF

59.0 KB Created: 2020-12-26 05:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4d1385f18d13320bcdada4e11e6652f4 SHA-1: e88b38ef88b494e1fab71325dff25e42fed0f674 SHA-256: a9b877f55c7a6fda7817d5998707c5fe157391e6d9924f4c6eb55d2a990618bd
154 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 'traffine.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded nature of the malicious link within the PDF structure suggests it is designed to lure users to a potentially harmful website, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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.
  • 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://traffine.ru/strik?utm_term=pink+lips+clipart+png In PDF document text
    • https://cdn.sqhk.co/fofasafiwi/e8gg6UR/phoenix_suns_players_all_time.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5fc4c7ead5f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5f8d50ae99664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467030/normal_5fe48eff52364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_5fba6a1d278bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465941/normal_5fd0b95c31559.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/95450ec5-9bef-4dfb-806b-286484b837c3/48010522429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87efc6c-f6ce-4794-b2d7-17f1518a8573/segovia_scales_practise_sheet_colour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28167d50-201b-4fe1-885c-350ed1b8e144/participle_and_participial_phrases_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496d4fca-92c6-4c7c-a46e-ed7c2d88d16d/miwarowoxunirukane.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_off0000acdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDC 5168 bytes
SHA-256: 2d7b2597f58029d090e8dac754e81e9fba1dee30d4e73afd524aa84658a58145
font_01_sfnt_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 9776 bytes
SHA-256: 0ae59157d256f6e5ad67a515d76f1cbc10e2447a34cbef9aec9a9fe0f83c97cf