Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f9980693101406…

MALICIOUS

PDF

71.6 KB Created: 2021-01-11 10:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 28e45d945165eb37ebd9ad3c731a6763 SHA-1: 7f6d4129f647311dca235828011f146c0033e831 SHA-256: a3f9980693101406951665348743f84bf68bf86cafd90cd672119702ee952d9d
162 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 'traffmen.ru'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack pattern involves tricking the user into clicking the embedded malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/aws?utm_term=drastic+ds+emulator+for+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fe824ecd1021.pdfIn PDF document text
    • https://site-1176699.mozfiles.com/files/1176699/lepav.pdfIn PDF document text
    • https://site-1182839.mozfiles.com/files/1182839/android_fm_radio_tuner_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5fa8f838aa0be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484641/normal_5fce96d66c472.pdfIn PDF document text
    • https://site-1171656.mozfiles.com/files/1171656/politics_and_the_english_language_quotes.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/padadutiseni/commercial_building_maintenance_schedule_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/vikegukozi.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/xikiduvirozinamox.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/map_of_australia_puzzle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/calculus_2_final_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/waltz_of_the_flowers_sheet_music_musescore.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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 5364 bytes
SHA-256: 60b66ba92e84bb29643cbcf3da18e7aecb917ba33cfca7d4373db8523e28c3cc
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 10248 bytes
SHA-256: 04e4983614cdc7af8ac2acf26c2d1ad21b44d41a5d42f9b00ec65902c859aa7e

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