Malicious PDF — malware analysis report

Static analysis result for SHA-256 efca354e1f8b281d…

MALICIOUS

PDF

76.9 KB Created: 2020-12-18 06:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f0755f2043008181eab996053e8e3d2d SHA-1: 1e608fcc3ff6246c60a03a10260ed72a38b4a4a4 SHA-256: efca354e1f8b281d435c3a5bb8a8d144853231cbab34fcea299bf36bc65b4368
222 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 'gettraff.ru'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent. The document's structure suggests it's designed to present a call-to-action, likely to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://gettraff.ru/123?utm_term=challenges+youth+face+as+volunteers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_5fb716a138209.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/ruruxubafek.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/5fc6941c1452f90b7f0c5d7b/t/5fc80114fbeb175295c61870/1606942999435/archer_and_olive_notebook_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61bc21f-83e6-4317-a5f0-225323206795/dragon_quest_11_skill_tree_jade.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29042d26ff1194f7e5c4d/t/5fd1e883133bcb3b88a0f2df/1607592067961/car_mechanic_simulator_2020_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/famlia_bromeliaceae.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/71455733658.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58baf084698658e7dd217/t/5fcf81f11a78ee5f0169eaa0/1607434738115/39949079223.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/formatting_columns_in_word_2016.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f913485235c86bdfb6d/1606377363555/18711384461.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_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5208 bytes
SHA-256: d60e41b81859c7466f0a06ecb0d69c66e54cd7dad0818ff9ddf3e587740f28c1
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 11092 bytes
SHA-256: c055736934c83e2ed313be1cb25531f29c1200da79fe53d66db85d5ae71a3770

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