Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4e82c40f26333e…

MALICIOUS

PDF

77.6 KB Created: 2021-02-16 12:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7aec195072863a182ed60e8ebe595e82 SHA-1: c52c7b453c102fafe87e33c4873607c7fc45f1ec SHA-256: 4c4e82c40f26333ed016603afe8cfa53f32cca831548964d1c2b5ec7c36a6776
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a lure related to a 'Texas cdl school bus pre trip inspection checklist' and embeds a link that redirects to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and a critical heuristic identified the redirector link. While no scripts were directly extracted, the presence of a malicious redirector suggests the document is designed to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=texas+cdl+school+bus+pre+trip+inspection+checklist In PDF document text
    • http://damodudajipofem.22web.org/nepotini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fd34de04e26f.pdfIn PDF document text
    • http://sfhgfje5df.xyz/heterocyclic_compounds_notes1losl.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/ggXSzcN/40373099558.pdfIn PDF document text
    • http://wei-nmvc.com/pujuruvodulumuxobixagzjft9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fe5fca320ed3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fc645eec15a1.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/5gdK9ie/monument_valley_2_game.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/Pii2haQ/59971356908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473616/normal_5ff677929df6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5ff2d7d77effa.pdfIn PDF document text
    • http://cleaner-inn.club/acha_chalta_hu_song_videous26c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_601e920e50aab.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/jahjRgc/26133812973.pdfIn PDF document text
    • http://shopwithsale.website/grade_9_math_worksheets_geometry9d2ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5febda7e684e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5ff8566253235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446398/normal_5fdf81db9c6ca.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/hbigmje/space_explorer_4d.pdfIn PDF document text
    • http://rabisuxegebe.iblogger.org/candy_bar_labels_template_free.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
    • http://mexowotevofo.rf.gd/44703515498.pdfIn PDF document text
    • http://vemameb.epizy.com/chemical_bonding_worksheet_tes.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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 5264 bytes
SHA-256: e8eee78490617bdfd942dbe073432f831e992c683c649414e50b0f33f2988b96
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 11244 bytes
SHA-256: 3390fd011122f098a1da4fe318adb810494f87a84c452c3202d43c5791a4d868
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.