Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92331403b408f7f…

MALICIOUS

PDF

61.8 KB Created: 2020-10-21 14:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d3f756cdfaee4b2b1bf4fe4971b94c41 SHA-1: 8f261ffe509d32a7f17bc84c997bd76b17432cb1 SHA-256: b92331403b408f7f8a6a70160ddf4bb17752da596b803dc4e472b9dec9bb3377
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, which is likely intended to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains the URL and suggests a lure related to 'the complete history of jack the ripper'. The ML classifier strongly flagged this PDF as malicious.

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/strik?keyword=the+complete+history+of+jack+the+ripper In PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/77608d.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/wepixixifob.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/9615d6ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f8ce10f0d6ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5f9019b6c16b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f8da33a75d15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0f5192-3abb-44e5-b331-208477db2a52/diwal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63aa22c5-ed86-4077-b9b4-cbf543359aae/83651596393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b35d65-2be5-495f-a9f2-0c4ab115f3c6/89630569956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0116c7d8-086c-4c8c-bd3e-ffbe80ef8e36/41385733784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76afe4a-13a2-4a56-ab5b-e0b4e3eca1de/comer_crcuma_fresca.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/96462105883.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/15043319340.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/jilanapikulifugiluku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3136/4252/files/thomas_the_rhymer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2220/8152/files/mission_bay_shuttle_east.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7855/8899/files/gram_stain_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8526/4575/files/dejut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/saveporif.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CF 5588 bytes
SHA-256: b2533d1bd7198f0cd71147b57bf0760eb39de72c2a0d99f1cddda3b5eaa8b372
font_01_sfnt_off00009757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9757 5448 bytes
SHA-256: 95dd3279991d05a43860697edaf06d49500683e9e57dfef80607bfcab9f0217d
font_02_sfnt_off0000a9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C9 11632 bytes
SHA-256: 7d0162d2eca3854d351ef309a6feb11024e32d0e9512b4d92c6cb2dd19d4a2b4
font_03_sfnt_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 16612 bytes
SHA-256: 827266eea71f34db9453004ad1ba79a940cb8e1b888f1db2c0cf0df0e3ff11ad

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