Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e899a8e6285fe4…

MALICIOUS

PDF

37.9 KB Created: 2020-11-06 16:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b145dc8f70d4bae73918280a38e475d7 SHA-1: 94c46edfbc73ca2a9a465fb4a877015b7f0b166b SHA-256: 03e899a8e6285fe467c87b1c052741f33d4b17b4f0ae8c0a2db1da450a73a95e
94 Risk Score

Malware Insights

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

The PDF contains an embedded link that directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick the user into clicking it. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/123?keyword=texas+gold+cup+2020
    • https://cdn-cms.f-static.net/uploads/4403428/normal_5f99169d736de.pdf
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5f90424f544b8.pdf
    • https://cdn-cms.f-static.net/uploads/4408853/normal_5fa3e76653c52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixamupelinere/86102510270.pdf
    • https://s3.amazonaws.com/rupatojuko/3268363166.pdf
    • https://fefitaw.files.wordpress.com/2020/11/64939725781.pdf
    • https://s3.amazonaws.com/subud/santa_biblia_1960.pdf
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.pdf
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdf
    • https://s3.amazonaws.com/sugowubuf/convert_to_word_docx_free_online.pdf
    • https://sapifotad.files.wordpress.com/2020/11/munich_manual_of_demonic_magic_download.pdf
    • https://s3.amazonaws.com/pojojagajevuxa/no_skin_off_my_nose_in_french.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/tefixatanix.pdf
    • https://s3.amazonaws.com/jotizifime/68887078596.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_off000054fe.bin
2e04b8ba776e367726b5ed62c7721a7e1aa12ad2966f1d466e9a64a6d4451cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FE 5436 bytes
font_01_sfnt_off00006793.bin
0af1b49f6fbc2d07f3b3fb85f717df1cd4980c7990ccf75ce4261972f492eb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 10292 bytes

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