Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea873a9f8183d292…

MALICIOUS

PDF

47.8 KB Created: 2020-10-25 12:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: ac5243fa34bbae3a0773de5d17b22bd8 SHA-1: 0d144dbfa7212458d44d122cfe4677e15e40a7d1 SHA-256: ea873a9f8183d292e5379aa51d1fe085690c886a1ed5f9fbfa71420d103038be
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as a "Best ccna security study guide". The ML classifier strongly indicated maliciousness. The presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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=best+ccna+security+study+guide In PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/katemofiseturoj_lakagez_kunajomeba_tajofe.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/zadexusu.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/potize.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/791cfdd7973c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8751cfa6969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f8b4f8fd3182.pdfIn PDF document text
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/2663582.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/kukajobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3682/6007/files/kefine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3250/9085/files/27891984885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1024/2198/files/50044068205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9691/5616/files/pathfinder_player_companion_alchemy_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2503/4148/files/3rd_grade_math_assessment_test_virginia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946e2297-ad86-4c7a-8a9d-f5e9eec70d19/bofak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5dc940-bbec-47cc-be5a-650ba857dab9/night_by_elie_wiesel_chapter_2_summa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36418a69-2dc6-42b5-9e77-a54f640bc090/95789350216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe33306d-40da-4d81-a7ec-f95cc3854ec9/maji_de_watashi_ni_koishinasai_download_vn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda4e42f-0b04-4574-842c-e0c3ef686556/custom_guide_excel_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c00fac6-8eb4-463f-bfdd-0853fc5ccb5d/3821610880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6edb1b37-0fae-463e-b673-62aeda67ebad/bidedadabivesiwimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d0adaf-51f6-4289-9824-1f1e734f01f2/85624966228.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_off000078f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F1 5224 bytes
SHA-256: 3beaa40aec2ee8a654c5e5cfb0e53180447f73352be34bd094452b378da765fa
font_01_sfnt_off00008ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC9 11312 bytes
SHA-256: f1d6234fa050f390a78cb05e6514ddefcbabdbb190f712b19b7acf5c90bc779a

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