Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f84de8b4ced5a6c…

MALICIOUS

PDF

56.3 KB Created: 2020-10-31 17:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3d86d1661b5cb0ebd82b0922d7487999 SHA-1: c566d52108f82e2807c195dc67a89b2f8e282d37 SHA-256: 5f84de8b4ced5a6ce023f6a978ba893086a7e44f4d0f6f46c0325c8c0bfba2dd
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it redirects to known malicious infrastructure. The embedded URL `https://cctraff.ru/wb?keyword=recombivax%20hb%20davis%20pdf` is the primary indicator of this malicious redirection. Although no scripts were explicitly extracted, the PDF structure and the malicious URL suggest an attempt to lure the user to a compromised site, likely for further exploitation or phishing.

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/wb?keyword=recombivax%20hb%20davis%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f8cb0e64aa10.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/4616454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f8b47daa12af.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/pulakenekoti_zomeji_xuxoref_satidov.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/xetowomalidupok-xinexumero.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/kosodi.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/9507449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/employees_provident_fund_form_19.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/superman_escape_from_krypton_six_flags.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/codigo_brasileiro_aeronautica.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/california_zephyr_schedule_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/fly_away_home_book_characters.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009adc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9ADC 25068 bytes
SHA-256: f076ba98b41a28b75630b7bbdf155fef20498b5f9765c5fe4975cd0aae49e6ee
font_00_sfnt_off000065fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FB 5144 bytes
SHA-256: b4ef468a663714d66b6b315d952da0c67e8fef944b5663a5afa421a74fb6ee5d
font_01_sfnt_off00007782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7782 10320 bytes
SHA-256: 6ba18fc9584f1bf9bcbf0ae516a4a7a2fd6d7132dbd9cbc8cd96167b1fd4d08f
font_03_sfnt_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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