Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1f4b21e5e0447f…

MALICIOUS

PDF

46.0 KB Created: 2020-10-14 04:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ee3bbdbbdff84200ccde7e4ddc9f42fa SHA-1: 6f97c3283254aa4391f35d03bc8fafb0b1dc7820 SHA-256: 8e1f4b21e5e0447fddbc090d185e2305004c2d58708008c311756dd55ff655c5
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that prompts the user to 'check permission android example', leading to a known malicious domain. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=check+permission+android+example In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/27959002801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2644/8023/files/50_cent_blood_on_the_sand_soundtrack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9329/8851/files/jovomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2722/7036/files/small_country_towns_in_south_carolina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/tupperware_smart_steamer_broccoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d19ff9-c6ea-4dae-8587-772f11f22560/45413149296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e385c0b5-de2b-46e1-af2a-a952b93e6448/85360548119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4039bb4-190a-436e-b80d-408f88e105f1/53964945787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b934f658-bab4-4bcb-90bd-6b46067b1080/12525237704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9016e6-88cb-4cee-b5f4-3ccd2c4dbd46/tanivawixunifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0522/3327/files/63669362155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1222/5694/files/first_alert_security_systems_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7641/0274/files/pimepunowolasufelebaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1250/5243/files/velocity_banking_excel_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8498/1436/files/calculus_2_cheat_sheet_series.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1015/7475/files/36322039103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/zinirakadoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/peg_perego_primo_viaggio_4-35_nido_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/four_fun_facts_about_the_nervous_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5553/0151/files/importancia_de_la_toma_de_decisiones.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6916 5176 bytes
SHA-256: 865888e87972d76ad8fe9986d4971ed5fda064b7376f328fb275d24a345eccbc
font_01_sfnt_off00007a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A81 9948 bytes
SHA-256: 6eea5a6f85706255a86e4b4de30663263bde02eb1ec0fc021513b7187563c916
font_02_sfnt_off00009c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C98 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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