Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c653b960f48b84…

MALICIOUS

PDF

45.4 KB Created: 2020-10-28 23:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d15227faa85c5ba1e8dcb32455fbd914 SHA-1: d8f9f046af9884375ad0eb47bcdebf0fed5c70dc SHA-256: 23c653b960f48b84f19db5bd2be92a370351f6d544eb8ec3f66a671aa6ff55dc
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=maze+runner+thomas In PDF document text
    • https://duvonejubuzal.weebly.com/uploads/1/3/4/3/134321315/9522772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5f91fff490d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f912f1f88a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f8bb3d2070ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f969a5aad5fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f87560e619ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_5f98393204f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f8cbadb58dfb.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/lolobojexuk-mewuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8f258111be6.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/vatosolikijike/klasifikasi_afasia.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/8756661330.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/37145286031.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/rig_veda_in_gujarati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/logical_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/knights_of_pen_and_paper_2_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/centrifugal_pump_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/cristianismo_primitivo_y_paideia_griega.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/ginizujiseg.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_off0000731b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 4948 bytes
SHA-256: bea7ff033c2323f460ab1cf4a8a37954dc5d5652f18f206b90befba2d2635933
font_01_sfnt_off000083d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D6 10840 bytes
SHA-256: ce8a7ec2f3faf4bd384494a9ff9e8219dde652ff4d86f34476c36055b04ff2bc

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