Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a8d65e5a823b67…

MALICIOUS

PDF

41.6 KB Created: 2020-10-29 20:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9c9de47a40d239d98b383bd9220e294d SHA-1: d85fd5df57199b97d43029160946c524796ed7fc SHA-256: c5a8d65e5a823b67cf0e62e0dbe7645a4b44e6ceeecdfcb3e40c451f4d41feaa
102 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?keyword=printable+arabic+handwriting+practice+worksheets In PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/pesujuzuviba.pdfIn PDF document text
    • https://fomezesas.weebly.com/uploads/1/3/4/3/134343882/fakowomus.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/gupuso/870483147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0518/7512/files/zane_leveling_build_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbbc0b5f-2e50-42ef-b61a-917d2c66c939/guwujipigebeboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e310dc-8947-4c6a-822d-4276978ce13a/trigonometry_formula_all.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7685/3153/files/foweropuzonerixujofolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c214266-e2f1-404e-abe4-b472f2529847/wulujimajaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/sight_words_worksheet_first_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc8ef25-b3b5-4357-90cf-c21f78a3fb3a/wobobizovasujuselegabik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6118/9040/files/23120977818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6934/1341/files/dark_knight_rises_apk_revdl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/87253954169.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_off00006152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6152 5632 bytes
SHA-256: 1cd4d5377cb2d6735aafb93c3b30b789ff0701d59444bcfb388d76f20715c500
font_01_sfnt_off00007479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7479 10820 bytes
SHA-256: f9a580f970a07714dd836cf92b558587945407cdba17675b06a08c796172b3e2

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