Malicious PDF — malware analysis report

Static analysis result for SHA-256 c756d4bc890137fa…

MALICIOUS

PDF

53.5 KB Created: 2020-11-01 10:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: feb546f44e40f1471be1f0bfb5a1d201 SHA-1: d99bcac8015a761b3810b97fc781820319c1d61b SHA-256: c756d4bc890137fa7689a79376b15e53e7eb46965fcd798ce1f2ac36fa9d05e6
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://cctraff.ru/strik?keyword=buy+laminate+direct+tullahoma+tn+reviews'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL within a PDF document is a common tactic for phishing or malware delivery.

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://cctraff.ru/strik?keyword=buy+laminate+direct+tullahoma+tn+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f8744ca6649f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5f9e38710027d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2973/9173/files/bnha_gym_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/dudavefifuruwuxas.pdfIn PDF document text
    • https://s3.amazonaws.com/newopetusam/silk_long_underwear_womens_plus_size.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9886/4800/files/metal_gear_acid_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1925/3922/files/voguwurejiwibuzilera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/brown_daily_herald_facebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8471/9274/files/zoll_m_series_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ef48c3-c3b3-4e36-9c4b-120a2925dad6/12370433678.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/3015984385.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5551/7348/files/womawidasav.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/jeff_sessions_testimony_live_stream.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/catechismo_della_chiesa_cattolica_compendio_2005.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B9 5480 bytes
SHA-256: f34a27c7e0ac385ac000996389c4c4f553cdfc1a24b2cda1b20c5af4abfdebf9
font_01_sfnt_off00007847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7847 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000083aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AA 10932 bytes
SHA-256: dc22d5f4bddd75d998da35b24ea704d5f0d61cd38be4686f7953618a4a5dac70
font_03_sfnt_off0000a8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F6 10212 bytes
SHA-256: 7f7de91e425724bd36dbc815d3cb901540e16ba40a9cfeca167fd15042fddec0

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