Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31c88641e5b06dd…

MALICIOUS

PDF

77.3 KB Created: 2021-01-18 22:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9bdbe7762ce803e9e247c3e4037c07f1 SHA-1: 27c713193cdc7d9b99033fca59cff17683585409 SHA-256: a31c88641e5b06dd9752ee19cd56162d6953900d356e34d4041eac8929a11294
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ggtraff.ru, disguised as a guide for Microsoft Access 2016. This suggests a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=microsoft+access+2016+the+complete+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5f8d7b3abe29a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5fc37fa8907b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5fff6921e31f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_5fb9e8ead28f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5fd1857d4f09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_5fbd1504991fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5ff5a27385fea.pdfIn PDF document text
    • https://site-1228684.mozfiles.com/files/1228684/69705038160.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/fedufiporara/free_letterhead_templates_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/chemex_brew_guide_intelligentsia.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/pioneer_car_audio_manuals_set_clock.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/samsung_auto_rotate_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/rocks_and_weathering_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/keto_custom_plan_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/refupux.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/1717032848.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/80754814838.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/google_spreadsheet_insert_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/summer_slam_2020_wwe.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_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 6052 bytes
SHA-256: 603a8d1077c74306297ac7df02dc5df26a32b3f77660b7750659f8f329cc9e36
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 10856 bytes
SHA-256: 4b28e7894bc9ec651f3428d10256a101d2141127638717622b0dad9bef15fa50

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