Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b74b8f75818bbc…

MALICIOUS

PDF

40.5 KB Created: 2020-10-26 05:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d05ef3735444f370f38a17f7e1f14220 SHA-1: 134bdb09d674b119382cea7d0430ae7060d57341 SHA-256: 63b74b8f75818bbcb7ce93106b981301cfbed9363b702f1ae98740a56d211fb2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'urinary system disease pdf'. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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://ttraff.link/123?keyword=urinary+system+disease+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5f8d1cdb2b2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f8d0dce2c4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f878e15468ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f8a3fdb69fa0.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/kixogepekovip_kevipomerawo_lumeg.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/fb376f985fda90.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/nunene.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/rixevozajixezos/vudajoxonus.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/11849267469.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/34748341542.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/amino_acid_analysis_by_hplc.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/29716651071.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/boravupuromewu.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/55795850196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/government_holiday_calendar_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4953/9989/files/dogwood_tree_planting_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4142/0979/files/antiedipo_capitalismo_y_esquizofrenia.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_off000061cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CB 5248 bytes
SHA-256: 94045355cb1138eacfd210efd9d8aebc67b878063d0b56d9db540f551108e75b
font_01_sfnt_off00007394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7394 9952 bytes
SHA-256: 06fdf02b98329aae408c7ea85276aeae3670d24238f38ed2e5225aabc3416a7e

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