Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcc21a9f3370854…

MALICIOUS

PDF

64.2 KB Created: 2020-12-18 11:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c1243f01fc7a91b2483e0827f0b95771 SHA-1: 9c573500ae7650a2e158b3dc2cf78142316398f3 SHA-256: 6bcc21a9f33708545294e541402ff4b1c97c8fffae7520962a7b219ae2c7fe25
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://ggtraff.ru/aws?utm_term=ann+arbor+weather+report+10+day'. ML classification and ClamAV also flagged this file as malicious. 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 vector appears to be directing users to a malicious URL.

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/aws?utm_term=ann+arbor+weather+report+10+day In PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fc611ab0d48a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f9c3f7c22335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_5fa7195bba9b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405902/normal_5fc896b89a1ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_5fd13d9ba5f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5f9501fb10bf7.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/tapexiw/capitulo_1b-_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/30924782807.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/orland_park_theater_troupe_cinderella.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/85120125061.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1138816f6d44b07bfcb5c/t/5fc15e739d79364840c0ba80/1606508148028/vadikusojetepop.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/4th_grade_math_worksheets_place_value.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/business_communication_full_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/spoofing_pokemon_go_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/aditivos_alimentarios_codex.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_off0000be83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE83 5356 bytes
SHA-256: 18657d149b8714de56fceb87290ecce6cace14a2aa4253d2d161635065d82af7
font_01_sfnt_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 9892 bytes
SHA-256: 3df1c95f71d38fc6440a5ca03e90c335e16cc4812c80dabec613c415a0c58aa0

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