Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55e10a35105fe7a…

MALICIOUS

PDF

39.3 KB Created: 2020-11-03 01:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 12554b43d59d3a3391bc76ff47ac1436 SHA-1: 5b59685dc8fb19619307105743b090d7b8709c80 SHA-256: b55e10a35105fe7ae5f812ddbf8d0b82d229802ea9a05f93583d85d141131e19
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://cctraff.ru/strik?keyword=usa+studies+weekly+5th+grade+week+13+answers In PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/40749ec0.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/kupubeluxubajo-fadapu.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/wibisijakaweban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_5f962f6ce240d.pdfIn 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://uploads.strikinglycdn.com/files/e41c30ad-bc83-4fa5-872f-e318162dddc8/zuzifatasebosobagutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba96298-f0e0-433d-9dbe-241db0efbb0d/ham_radio_general_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/proficiency_michigan_past_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e64c667-ba57-4259-9a99-974ea767109b/38961874547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f360448-6f9f-4401-ad55-42a7ee6505d7/melogubiferofozagubegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746cc0b4-05c4-4455-b4ab-4d6ac47c804b/tumutexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd957187-07a6-4dbc-a1c5-acbedb47da3d/gigajidunav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9706f15b-70ad-4c49-8e6e-04e1d00a2186/covalent_bond_practice_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932e98e1-b808-4e55-abaf-1caa1e189ebe/baywatch_full_movie_download_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62959ebb-7249-4bf9-8b43-d4bad0d06e55/rejavifoxanibetotebijame.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_off00004ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADA 5448 bytes
SHA-256: 0f1a78c26437b34dd55fee95d9b7eb7a50fea24bb77c27031c531f80969846c4
font_01_sfnt_off00005d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6F 10876 bytes
SHA-256: 7f0b7f48353b053f3d319d7c0ebad7d56974938f4a0e15995d0ebb1b4a0ee9d6
font_02_sfnt_off00008248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8248 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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