Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fbfca84c825893…

MALICIOUS

PDF

72.2 KB Created: 2021-01-16 13:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ba13803e228d0770278803e94a188293 SHA-1: b8f33e8e10b17262ee5565a9c65bd333fad5d6d6 SHA-256: 73fbfca84c825893a23ca13e4517b42318db5cea6e9a638cde826ebb0ca80434
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, many of which point to redirectors and potentially malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily obfuscated, contains text related to 'Terraria mod apk all items free download', suggesting a lure for users seeking such content. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=terraria+mod+apk+all+items+free+download In PDF document text
    • https://kinefevemupopit.weebly.com/uploads/1/3/4/6/134631160/9816534.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/ThfhbiT/digital_strategy_process_model.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/j3nijlC/gas_properties_phet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_5fbcb97e30a14.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/highc4S/bubble_bash_mania.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5feb4f521f965.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/jgjdtFh/wechat_pay_users.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/5jgOGig/horror_scary_sounds_for_halloween.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/kizuporowefib/the_rainbow_comes_and_goes_quote.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/the_apostolic_ministry_rick_joyner_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/mechanical_cutting_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/ios_7_keyboard_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/tegamopimini.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/designing_interfaces.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/98116884537.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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 5292 bytes
SHA-256: be8df694040be75b97aa4f9084f834242029c8019244de394948577425fa53bf
font_01_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 10480 bytes
SHA-256: 18c23769b3bd14cb6473bc3de83c3b1ca3e30fc7ee310b550c310f6fb0749735

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