Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cbe8fe4ffd8349…

MALICIOUS

PDF

70.5 KB Created: 2020-12-28 04:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a1e2aebd8c22872d00324a2045310500 SHA-1: 0098a9be4dce85ed0e7452dc0a0094c13fc36d34 SHA-256: b7cbe8fe4ffd8349a21662242df6b334efbcd9efff9cc2768f245d7952edf121
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically for downloading a Facebook Lite APK. The ML classifier also strongly flagged this PDF as malicious. The embedded URL leads to a redirector that likely serves the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/wb?keyword=facebook%20lite%20apk%20latest%20version%202020%20download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_5fb2e7343d0ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5fcdd04366d04.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/VnJfuCX/mortal_kombat_xl_vs_11_characters.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/b9d0ad2e-c304-4b60-aaac-2eacc4910a25/97967154998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516453c5-69da-414b-b97c-45e00f43fe95/vuwukerasiboro.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/example_of_business_consultancy_report.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/753376874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd7ad9f-ef88-4693-aa3b-916fdba1fc7c/81384128688.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/advanced_deluxe_dictionary_english-_english-_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/dugisovuj.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/diary_of_a_madman_nikolai_gogol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00efa6c-6c44-4133-a37b-4f83b77d1d1c/42111398809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e89238-9806-4648-8db1-c7a625a13dd8/vedekezufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ce8dab-204a-44d2-9bd1-684c58fc5a83/21536364252.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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 5652 bytes
SHA-256: 73b83dee8b9ed6138b0287ef70597232ff8db2ff61a9abdfa39e2133a92b75fc
font_01_sfnt_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 10796 bytes
SHA-256: 437c59bf843455baf9db6009098296837eaaf0730d722f8c675e57ef0fee4f34

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