Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8bd20e4ef43953…

MALICIOUS

PDF

41.2 KB Created: 2020-11-03 09:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb923c9e6cbeac9113caeb9cf2a76e25 SHA-1: 93c83e2fef6d26e6850bb92b79d610bb7f873594 SHA-256: 5b8bd20e4ef43953883749ff2608208cac0653ce8b430b7c87dc301c39bc316d
94 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 'https://ggtraff.ru/strik?keyword=laura+moretti+nutrition'. This indicates the document's primary purpose is to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the redirector suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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/strik?keyword=laura+moretti+nutrition
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/jojepuv.pdf
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f8bac1636fb9.pdf
    • https://cdn-cms.f-static.net/uploads/4416506/normal_5f9a0693f097d.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f96038a1ca11.pdf
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fa09bdbca682.pdf
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5f932cdeeec3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wajufifenoxuj/nazijipojolovesigijetemi.pdf
    • https://uploads.strikinglycdn.com/files/348382db-8bfb-4c60-8dd3-c4aaceaf1eae/hg211b_clock_manual.pdf
    • https://s3.amazonaws.com/fasanag/84632331607.pdf
    • https://s3.amazonaws.com/wenobagupexekap/7743280407.pdf
    • https://uploads.strikinglycdn.com/files/2e571cfa-d661-4e7a-a397-250e9bc9a5dd/wejiwudorebaziremop.pdf
    • https://s3.amazonaws.com/dazinibonofobi/amsterdam_guida_turistica.pdf
    • https://s3.amazonaws.com/felasorarabipis/37350194463.pdf
    • https://uploads.strikinglycdn.com/files/5ca47ab7-436d-4850-be78-9d5818b167bd/xuzuvijamukanaxatexowego.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656d.bin
93441e76147ac535320adc17cce33d1285e76742362f8b84af4bd0b79208b915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656D 4560 bytes
font_01_sfnt_off000074d8.bin
dd7a6c80461a58cf1c52e654a3c9fb29bb6b5a4d36ced533daea712cc8756705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D8 10392 bytes

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