Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffb1e7b6cfc6f3b…

MALICIOUS

PDF

76.1 KB Created: 2020-11-11 19:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2f44a7c8628057ea393d945dcc137890 SHA-1: 1c577e1b463c934ccf06d11ea3e765f66741fd38 SHA-256: bffb1e7b6cfc6f3ba105650e2a30f2146855cf6e0cc9b7f6c94ac9479327cb56
154 Risk Score

Malware Insights

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

The PDF contains a malicious link disguised as a search result for 'Netacad chapter 5 answers', which is a common phishing lure. The link points to 'ggtraff.ru', identified as malicious redirector infrastructure. ML classifiers and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=netacad+chapter+5+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5f9d9c831b1c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f9b0921c4d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f8ec415e4b49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5f8b97ed08b7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fa736d378471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_5fa86e8bf21e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f90e6ae83881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f883a0328702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5f8e95740fa52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5fa15e060b2db.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
    • https://s3.amazonaws.com/xisefowu/79516586176.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/blank_february_2020_calendar_page_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8de4ab-6403-4691-b883-5576614983d3/femomij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b4a755-e512-4e8e-9be4-bad9d764cd71/osrs_blast_mining_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8b823f-b6c8-418b-9d4e-1bb54a7855f6/xaxezabujokudorapuv.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/analyze_my_writing_text_lexile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c028c618-13ec-4b2c-9406-eff087299c4a/fotagamufufuweleweputege.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/sekiro_pre_order_bonuses.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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 4944 bytes
SHA-256: 7c87f8b79b5acc4b32406fa1197b65e1913c9861e23fab71239e5619800e8d7d
font_01_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 9992 bytes
SHA-256: aa82748091393632226eb45fe260d467a133dcf525f24fba230ce125f48e59a1
font_02_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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