Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cc301d9a5a5947…

MALICIOUS

PDF

42.8 KB Created: 2020-10-25 20:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3eedf26d700507826b52faf8d975cc9c SHA-1: 12ebc17c15bdb05335c2dcd169dcf5abe5965ae4 SHA-256: 24cc301d9a5a594788463d27e9f9d0d6f3c807b9015d0d942ee97d702257ae04
114 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=minnesota+registry+of+nursing+assist'. The document body, though heavily obfuscated, contains text related to 'Minnesota registry of nursing assist' and the malicious URL, suggesting a phishing or scam attempt to trick users into visiting the malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=minnesota+registry+of+nursing+assist In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f873a83686dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5f94d65d27f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f8c2a978208e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8760469e7d3.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/b919b1ed8f.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/91ea66.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://cdn.shopify.com/s/files/1/0437/4632/8737/files/51098798318.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2524/4065/files/analog_and_digital_video_in_multimedia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/7721/4884/files/77080900889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1443/7033/files/vuvot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9226/1529/files/zovopelupagiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b14cfe1-2605-414c-9706-fee4d656af1f/91348097939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5417bb1c-04dd-4315-bef7-725529324b0b/69341367462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3727e402-45b6-4781-8e80-bade0764058b/52058655315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df8da39-8675-470d-9861-f41ec754bf54/protoboard_vs_breadboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10641907-d966-4b24-904f-450ec0c1d740/54796522734.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/capitalization_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/soxipazido.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_off00005a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A90 4892 bytes
SHA-256: b6d77acc882efdad306aca40a7bbbe5a5a3a1b358bd3ff10afd757a62a1fd0b5
font_01_sfnt_off00006b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B50 10724 bytes
SHA-256: c0661a127f6e481a7311c9982c3e2436ffb21c5202ce1c5f44d85c6cb307a416
font_02_sfnt_off00008f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F47 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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