Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6c78994b8d31c6…

MALICIOUS

PDF

81.9 KB Created: 2020-11-30 20:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 194c502c44a77a713482736058c28886 SHA-1: 3cf67400ce5d2905b65351e0b35f26236b944419 SHA-256: 4a6c78994b8d31c6f1c5e79ed9da3d5491e904361e249c28c45fe2d3b26d5bf2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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 'https://traffmen.ru/strik?utm_term=anderson+v.+minneapolis+st.+p'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://traffmen.ru/strik?utm_term=anderson+v.+minneapolis+st.+p In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fc1f14a44887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_5fb3caa5909a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5f9f3a801ed1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_5fb033dcd63cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5f956319cb549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_5fb2914dbcba7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc07d836b97992eb55a0df7/t/5fc15cac1972c46e3cd1c7e8/1606507694392/bugisubidol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf4c0e6d49a06bb569f2e/1606284480721/3_ninjas_kick_back_sega_cd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf415b7ee8e70759d9954/1606218773587/write_better_essays_in_20_minutes_a_day.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd046bedabee7b44084ac0/1606222956056/nefuzewugodejome.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1210ec89e1c4b8fbfc3b6/t/5fc50d6af8cdb769c682d2f1/1606749547769/lg_g4_weather_widget_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf3a5e8e827d428d5c84/t/5fc3d2eb3c02f22b9d822200/1606669036166/81989922438.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/xtra-pc_reviews_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/dias_son_estos_de_elias_letra_paul_wilbur.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d766a3bf4b14aba8e616/t/5fc11a973f75b16643fb5d1e/1606490776494/jamie_eason_12_week_program_printable.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_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 5184 bytes
SHA-256: bc5d6c5036285c657f736165f3015c5428e1fc71cae9712e70a57e139f639ac2
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 11276 bytes
SHA-256: 9be3cdee82c5b7a3d555c2c42e341ca397a71659e17d2d7337979c0fe337f402

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