Malicious PDF — malware analysis report

Static analysis result for SHA-256 976dff06520dd06f…

MALICIOUS

PDF

45.8 KB Created: 2020-10-27 05:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f94dcadc93557dd373c4082066197a62 SHA-1: c0ce729fe1d2e400c441ae911fdbc9f8a000756e SHA-256: 976dff06520dd06f4950b0b0d905a1ba62dce3e14f90e7ef36c87eb47f4ca0ee
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest a phishing or redirection attempt, likely serving as a lure for further malicious activity.

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=capital+letter+j+in+cursive+writing In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5f8b04124eebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f8d0e8a41109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f89af144a296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_5f8f8c878122d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5f8ce63785512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f8bd57b4850c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f884eded3c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f88d17b2dd2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f8deb620b79d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/tovupenobazezakoketu.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/jitimawopimuzaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/86353039169.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/92516188892.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/moliwegozofipi.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/bugadejewogapuwoxajomejuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5a6ccd-eaa1-4488-b146-08f911479a49/genetics_practice_1_basic_genetics_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b52da6-0c62-4959-aeac-54e16c15b0de/11554600667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492996fc-3c4c-4aa0-869d-b89fa551b714/como_crear_macros_en_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a75d4b-25c4-46b2-aa5c-552b0998c396/pomusujunagegesud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6344e67f-abd4-48d3-972f-1a314eb23fdf/8751747373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a85e5d-6b6c-4147-b113-a6f985486ac0/rogebabumozemupug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C1 5232 bytes
SHA-256: f6a0b8551fff3645c497d3ef02417509fc50e5c58bd2109d6e9c178cc6a38f8d
font_01_sfnt_off000084b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B7 10988 bytes
SHA-256: a13e357f7c4b02dc52514b15c0e2d1dbf2b4c167ca605097d2add28af8294554

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