Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8fb1487402b765…

MALICIOUS

PDF

46.6 KB Created: 2020-10-22 18:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e4f8cee46bae1fc84e23d238fe64a71 SHA-1: 7539d5736f7e9b0744c29580242dc0ef289a8c82 SHA-256: ef8fb1487402b765f0d42ce0f6ec5d1818ec4570db7d1f091592cdcf9de8e758
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to URLs that are likely part of the malicious infrastructure.

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/123?keyword=priere+magique+pour+attirer+l%2527argent+pdf
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f8750ef63ded.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f87ff31d423d.pdf
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5f8f2edd9ea44.pdf
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f8750f91ce9e.pdf
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f8741384cd16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e927e9b4-7227-462a-8164-4afd661b6a83/stihl_chainsaw_ms180_manual.pdf
    • https://uploads.strikinglycdn.com/files/a12632bd-d439-4c7f-8eea-1040968435ba/76317904922.pdf
    • https://uploads.strikinglycdn.com/files/d1920e16-79a1-47a1-af2c-8259772f124d/ac_300_ecolab_msds.pdf
    • https://uploads.strikinglycdn.com/files/3e2aa961-98df-4a15-97f8-357be6ffb968/3761726428.pdf
    • https://uploads.strikinglycdn.com/files/11720333-93c4-4cbe-afb4-cfdd0537dcd8/levosax.pdf
    • https://s3.amazonaws.com/henghuili-files2/kepatopawidivasas.pdf
    • https://s3.amazonaws.com/zetare/voput.pdf
    • https://s3.amazonaws.com/nawosineromigi/college_ecology_textbook.pdf
    • https://s3.amazonaws.com/gupuso/18607508306.pdf
    • https://uploads.strikinglycdn.com/files/ee838ffb-748c-4878-b9f5-eb865ee33417/17247346983.pdf
    • https://uploads.strikinglycdn.com/files/96e4edb4-5508-4b84-928a-d4bc036c892e/14373332040.pdf
    • https://uploads.strikinglycdn.com/files/46961b20-0b73-4d31-877b-d363353d12db/fatutuno.pdf
    • https://uploads.strikinglycdn.com/files/30fefa7b-d599-423c-a6c4-af400fa9b544/saxon_geometry_answers.pdf
    • https://uploads.strikinglycdn.com/files/600bb57d-5522-405a-8585-45040d02d7bf/90957887389.pdf
    • https://uploads.strikinglycdn.com/files/2e77d2a5-049e-401f-a18b-53f8a8b0b648/77282270938.pdf
    • https://uploads.strikinglycdn.com/files/388a7a8e-3b2a-4015-a33a-85119069a30c/77483810079.pdf
    • https://s3.amazonaws.com/vixuwogetiv/sosial_budaya_indonesia.pdf
    • https://s3.amazonaws.com/vexeliku/boxovodamadenaruloda.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_off00007431.bin
ec56a7df6a50a93337e07bd8d2ccc717225122f4d97ef4e0af54a851f8c0c3e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7431 5344 bytes
font_01_sfnt_off00008641.bin
11fbb43e30abfaa317613f19837e5a5f5f9f0ce3f51dee14c3bcde502580e02a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8641 11668 bytes

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