Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a37d5620e3d8b9…

MALICIOUS

PDF

42.5 KB Created: 2020-10-29 06:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d247cf175a27168c2d9e31c16ac2b3b8 SHA-1: 93659938564b1f888e03658772eaebaa9cb7129e SHA-256: 14a37d5620e3d8b9d25a4df7d95780ff8f5f9ffa9906370f330abd9fde595c36
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.link/123?keyword=paranormal+activity+parents+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f8dd07ce30a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f8a04226e103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f94fb3b1ee0a.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/e934460f-aedd-4437-8fa0-9b7af1b669d5/442198689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1744a567-17ea-43ac-9a2d-df7ef2299cc8/eldritch_blast_dnd_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e39152f-165e-46da-b7eb-2f2f218e764b/14171968911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5349/3655/files/acc_aha_afib_guideline_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8d49d1-3a9a-44f1-b5ab-aded1f4d8a1a/jim_henson_pictures_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feee6472-c89c-44b5-aae0-c04dd913e32d/romeo_juliet_tamil_actress.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/88243406876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c6f73e-d6e4-4a84-8860-c562d4866bbe/wobefugugosixez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5230/9923/files/levels_of_analysis_psychology_ap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e082808-2a90-4328-b6c5-0492b8164ed8/80614147925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3737/4656/files/nubidibuxenewebosebul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d79827b-cc94-4fd2-b6af-0b7473ba0440/zudowirurovesirake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bd0e89-009c-434c-87ef-7e9618292e8e/48110097897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231f92d8-dbf3-4d97-8f93-3cfc3912f06c/36716357050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1732/4712/files/sagesimasidelej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6cba93-595f-45d7-96c8-9af061435886/poemas_de_natal_curtos_para_amigos.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_off00006887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 5556 bytes
SHA-256: 2be3120607df2199929e77e51634a8f2861ea5852f3f2590b93407a10f6a0936
font_01_sfnt_off00007b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B61 9752 bytes
SHA-256: 7f0ad89dca75654b66fb904007b0706ada8990305685dde896e57c1df0f0ba7a

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