Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b69c3531c8ff68…

MALICIOUS

PDF

43.9 KB Created: 2020-10-23 04:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d5063cc36e1a998d21be19d3aecda87c SHA-1: d411d8ce1ff3f1353c1c5128b533ceb84dc4606e SHA-256: 19b69c3531c8ff68cfcdb6e8659fad62e99e59d4bf62fe6514c0c8a678e96fd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a deliberate attempt to redirect users to potentially harmful content.

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://ggtraff.ru/wb?keyword=signering%20av%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f8e4dee1ffca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f8e88d2cb353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c6fc7a-529e-473a-b10f-e4a246c00906/kutukeramosonilomulevavar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2278f290-92a0-4d57-bbe3-09edf1edae79/71480609497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f4253a-50c1-4502-8f0b-c1e3d3a63f3a/zonojudexom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe72b45-651a-4785-a03b-9f00a2997128/pomumatonimogir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5008/1690/files/31026948319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1086/6851/files/53376931942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9219/0379/files/new_nike_drivers_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/equations_with_fractions_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/sorebimuxolunorililiteri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9031/4141/files/97124398675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7488/2198/files/8773031883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7177/5142/files/minecraft_1.14_time_set_command.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0124/9444/files/stove_top_stuffing_mix_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/anestesia_general_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/nios_deled_assignment_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d663a528-1155-4085-bd1f-46a4404ac741/vixodaditijenev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6eb1af-8579-4bbd-a9e8-1738495659be/anlise_qumica_quantitativa_harris_6_edio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1187d5ad-6469-46d0-9731-c00b348bd549/redumabedutiwapawoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edaee67-c4ad-416b-b170-6797ca4c2d77/elvis_film_complet_en_francais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ffccd1-7506-4a77-8b53-751fbbf6e7e2/vuziwixererulegekisudalo.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_off000068e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E8 5160 bytes
SHA-256: 2c0e760e2cef838794668460b031051c8d6dda11fe46432c1f65b4ddab4f99f8
font_01_sfnt_off00007a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A86 11536 bytes
SHA-256: 1b6ee7e645bfbd3455c6704924fd018e3fa2b5ea513c0bf1140c68e6e31dab01

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