Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fa8848ce130cef…

MALICIOUS

PDF

40.2 KB Created: 2020-11-08 07:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fef1e110d3b8342f939084accf73e502 SHA-1: ef2a5329452725c4b318c4949baf5067aceb00ac SHA-256: 31fa8848ce130cef80d90c7bdb9661d6048e595a5358ac511aa9c3083f7e304e
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://gettraff.ru/123?keyword=corporate+finance+study+guide 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://s3.amazonaws.com/takeju/walkabout_travel_gear_llc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d1d799-d9bd-4e81-b844-de3f0161c06d/where_is_the_wps_pin_located_on_my_hp_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/volategifer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97637e6c-90de-4b55-b718-d33a55b02439/difiwegudiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2ca6ca-7bdd-440f-a32b-279fe576e993/32836293636.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/wotodogorewupadiwok.pdfIn PDF document text
    • https://bajabilidafa.files.wordpress.com/2020/11/over_the_hedge_full_movie_download_in_hindi_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d127b8d8-c080-4ff4-8572-f9e1bd60c4e2/kanire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ca6d3f-6e19-4b68-9f8f-2a19d6a6368d/81254912371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3e9430-e50e-4cb8-b96c-e270588c9c8c/928371159.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/5306494231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40731653-e457-419f-9544-20b5ae234b77/tulinusezaweforusunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b4665a-7667-4ba6-8eb1-fdb560255fe3/mt_carmel_park_sc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6193fc2d-cfd7-45ad-848b-c39aadb4aa78/92770972415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bea0dc-6f8e-49b7-b0da-a6f7236b0a7d/bilapupix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a722de42-e15e-4d94-bcd0-6150dd070d2c/fipadapiwe.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_off000050c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C0 5300 bytes
SHA-256: 4571bca11cac8f5731cb0e8f55e63a90fd1727f49ef0ddd4cca9fef188cf3044
font_01_sfnt_off000062d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 10236 bytes
SHA-256: a391a5abdfef50ba04377b75ce4d9850c88c4b85935e74f8dccefe49f86b98f2
font_02_sfnt_off000085cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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