Malicious PDF — malware analysis report

Static analysis result for SHA-256 d489ad3fe4a3d242…

MALICIOUS

PDF

41.2 KB Created: 2020-09-03 02:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f580620f7812604cc4d900f9d1e8cafb SHA-1: e312dff4e4b6881ceb3b27c18f8146934ee74de3 SHA-256: d489ad3fe4a3d242bdfc492ea8a4e728f3fd1461c7d3d3caf13d69149ad91c17
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is a redirector that appears to be part of a link farm, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, reinforcing the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.club/pify?keyword=shooting+stars+background+video In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/de9003_1343ccd3df9b4773a5cd70a829982947.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_7ee74ab9be734382adc4f1d9a70bd5dd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d4a9d6_1fc8c53a3f3b493a88bfe855dbdcd12e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/409ca8_65cced5a95e7418d9c1e53c0010103be.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1acd69_f06d818a824446709e939ef23360ffa9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7ef0dc_92bdd3392630446db1531d8bd54fa2b9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/73f3b0_50583bb237a04e6fa91459ee1ff9c2ef.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/866690_07e7ed24a4614233b0763635d9bd7553.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6203b9_4c790ab432164cdaaa44df2cb3310968.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/de65f7_d8706c570f034713b4f836513203af7f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/912de2_3b9022faa6be41e4853bf05b174f25d2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/225520_8e7aaf36f289475fabfca97ff243735f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_360ba4087b444a88b9bac8fafcf6f441.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_43fe713b69d44bbd96c5c0c2bd08fd88.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fd7405_2f58c323524548ad81f39f392fc3e0d2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/30ea26_a3f97e05401148fe958a0ec05d1f0b82.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_off00005a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A66 5536 bytes
SHA-256: d061bf9d8cee56edb4ef1b77c706b43311fd60c9e4cccc7b9f7e6cff26e5e91d
font_01_sfnt_off00006d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D38 13728 bytes
SHA-256: b580b8eb15e703df11c4f6a9b30b58385b79ba3783b51d8d92455d1f34112ffb

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