Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1be4f2cdb28241a…

MALICIOUS

PDF

52.7 KB Created: 2020-10-31 07:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 91e3e9db56cf50b5cfa9c711dfe71edd SHA-1: c010d8de2ccc156cb182a93b5885e24e95971c77 SHA-256: d1be4f2cdb28241a405ed527567db0568777276242d33d6dc769812423cd27a9
94 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a phishing lure, directing users 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.me/123?keyword=data+center+operations+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f89ea099f4b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f9118174fe07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f98da30d6d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5f937a7790898.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://uploads.strikinglycdn.com/files/0992cf52-ace2-4082-ae94-2054980d738c/760_area_code_state_location.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/skialper_buyer_s_guide_2017_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc11ef5d-5579-4e44-aae1-80706337e17a/xapubisefed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700dbe51-1255-4742-ab63-562b767ddaff/loxezopunedikijovuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a2215e-b2cb-47c1-8ee1-b664519518d3/58017778524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee91a3e-e970-41b6-b7a6-e1e3ab65b3bb/puwuzesenotexo.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/wedimalezokemelewegulu.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/37710996828.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/7468708436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f62698-b491-46eb-95ae-c23b608b9837/blood_of_the_lamb_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000831f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831F 5184 bytes
SHA-256: 0c8c8f3c5773a8b88d591ff22734abd042e4b788ef491c0f63ab8b5a19d31e48
font_01_sfnt_off0000949e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x949E 10416 bytes
SHA-256: f5372fa7f1d6473cf06ee3e509d4a799d56b99e17ffab3d6a09654fc7d1730d3
font_02_sfnt_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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