Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c03bee8a2b7dba…

MALICIOUS

PDF

42.9 KB Created: 2020-11-07 07:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 79619e5412b379774ddebb1b14f7c938 SHA-1: d72e12d29a8ec796f4f8739a2910231e2269e42a SHA-256: 38c03bee8a2b7dbadd30814a97d67f2f010629f9a737ba8dbe862be1b777c690
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure the user into clicking it. The 'SE_SECURITY_BYPASS' heuristic indicates the document may also instruct the user to disable security software, further increasing the risk.

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://traffmen.ru/aws?keyword=hub+network+games+and+shows In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_5f99e7731549c.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/ad72eb6c-6b07-463e-b134-853ba0f7e8f3/lmfao_party_rock_anthem_download_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/92194174175.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/becoming_vegan_brenda_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/13429810652.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/5360285598.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/thinking_bout_you_ariana_grande_lyrics_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/kabuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85979a2-b7f9-4ece-8281-82f6523f60a6/pivonomivawaxejubidose.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/sezaxodugalobokivilam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b3f0f2-0dea-43b8-9123-50f25247fc1a/36373803546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ceb70e-9d08-4f8c-8080-6fe2863da496/xalupoxov.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_off00006855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6855 5464 bytes
SHA-256: ac25bac1da3b2edddf02a2a54fe3f262617de909f27d918a722dc06b9a672970
font_01_sfnt_off00007acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACB 10544 bytes
SHA-256: f161cbb78f9a475c2ed3d95f7487f513bebf34981824c57135830f08d08afbbe

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