Malicious PDF — malware analysis report

Static analysis result for SHA-256 d853f11b6d975dbe…

MALICIOUS

PDF

46.1 KB Created: 2020-11-01 23:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 817920dfe9ffd6ef8d38fe8335d1a039 SHA-1: 8d019ac437dc4b58d44a6b14bc36ec0ced708ebe SHA-256: d853f11b6d975dbefa4066bfaa99d24c6fc3511ca5f1d1aa2b9601b1c702af0e
94 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing the user to a malicious site.

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.ru/123?keyword=looking+for+answers+quotes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f880820b6e51.pdfIn PDF document text
    • https://xutetuzaxudekit.weebly.com/uploads/1/3/4/3/134371691/rurafenano_zugebirowep.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/xisakazelelinim/62816385716.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8172/0515/files/fossil_shark_teeth_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3061/2637/files/2005_secondary_solutions_the_great_gatsby_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6370/3200/files/sufagodusegiminemowekab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7553/2483/files/forbidden_list_yugioh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501fa5f4-58e0-424a-a87c-e6a5c62ae325/bakivugota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0082/2934/files/harriet_the_spy_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2191/7086/files/where_is_area_code_866.pdfIn PDF document text
    • https://s3.amazonaws.com/legolikagamop/fuberukasobarufekeju.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_off00007635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7635 5128 bytes
SHA-256: c5ef91efc9cf41bd84a1c843e059bbc2ed55252c24e6df5eb1143e9b145950b7
font_01_sfnt_off000087d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 10548 bytes
SHA-256: a732e11142d69f9067bfe7add755a23cffdac0d1c6e017352376890634f90571