Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8fb3eddeca5005…

MALICIOUS

PDF

115.6 KB Created: 2021-01-08 00:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dd98d06bdc564669d120d8c4523ebecc SHA-1: e853f39388d6af8b062a737da22ec34480dc01d7 SHA-256: 7d8fb3eddeca50050a5d6e8d6bd73ac51a1ab875bc08acb6248e78051cdca8d9
162 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 'ggtraff.ru'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text suggesting it is a 'First aid workbook', which is likely a lure to encourage clicks on the embedded malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=first+aid+workbook In PDF document text
    • https://cdn.sqhk.co/fepogosu/ihOgcXm/arcade_shooting_game_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5fc727eb85897.pdfIn PDF document text
    • https://cdn.sqhk.co/kesokirow/idggibb/hello_kitty_carnival_theme.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/cN7jfJD/draw_lines_of_symmetry_on_2d_shapes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5fa265e7e97bb.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/jcNkjf9/pyramid_solitaire_saga_level_182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5fd0635424b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5fad7393523e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_5fdb373e5d9e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444096/normal_5fe57002edf79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fd352aa1950e.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/dovulavavo/fourier_transform_examples_coefficients.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/vezurejimokujagebigux.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/l360_adjustment_program_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/astronomia_nova_livro.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/fewuk.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/xopozenotunuto.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_off00018cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CF3 5036 bytes
SHA-256: 1d0aaccac511cd92385632ba4c0a4289284973b9bc787fac90b02f74dc6b0245
font_01_sfnt_off00019e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E39 10332 bytes
SHA-256: 3a6fdd36a03579c33a710c4101d4c3d80cc6c79a7052d13a609bada42472337f

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