PDF malware analysis — malicious · fad3510fa586a44f

MALICIOUS

PDF

52.2 KB Created: 2020-10-23 06:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: 973490c10bc3dab6f1dbf361af5a25a9 SHA-1: 47997fda438add100e7784da347b45e71e040ae1 SHA-256: fad3510fa586a44fd0c6aef1dcef592642aa2fada42fefcefa0c65fe22f35d5d

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external resources. One prominent URL, 'https://cctraff.ru/strik?keyword=los+verdaderos+cuentos+de+los+hermanos+grimm', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to PDF files, suggesting an attempt to lure users to malicious infrastructure or a link farm.

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=los+verdaderos+cuentos+de+los+hermanos+grimm In PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/memul/atualidades_para_enem_2019.pdfIn PDF document text
- https://s3.amazonaws.com/mijedusovineti/davivodefotetuwerifogakav.pdfIn PDF document text
- https://s3.amazonaws.com/gedimuta/86485135200.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c0be04ab-1f18-4e08-9d62-9acbed69f581/87118735850.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/868d59b0-fb42-443d-ae19-9eb5febde221/fipegoni.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e4284e5f-2589-4cf6-a33a-025babe7c32b/rugiwufoleropovor.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a7fec9fd-d6e2-49fe-99bb-ba7abddb2477/84176603542.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/92ffd2d9-dbb4-4d90-b5e3-eeaaeb2ea6ee/79004045453.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0495/2660/3942/files/78966219752.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0497/1954/1921/files/power_of_a_praying_wife_free.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0500/5328/4008/files/assembler_directives_in_8086.pdfIn PDF document text
- https://s3.amazonaws.com/jamokaroxoj/xizifakepikapak.pdfIn PDF document text
- https://s3.amazonaws.com/mibiwivanetuj/durga_saptashati_in_hindi_gita_press_download.pdfIn PDF document text
- https://s3.amazonaws.com/lumixi/metro_df_mapa.pdfIn PDF document text
- https://s3.amazonaws.com/jiguwuzobozobaz/euripides_medea_play.pdfIn PDF document text
- https://s3.amazonaws.com/bawalidamovidud/tda7377_amplifier_circuit_diagram.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8b749698-65d2-49dc-b522-a075d3014e1b/wosoponaseverorewuwe.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/597b4cd7-4055-4b71-8d0c-423d2a141c9e/dojixajuvonopegivozalotub.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4edb9cf4-a020-431b-ab7d-6dbc929617a0/30401322888.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/15ac25dc-7b1c-4948-addc-ac550fdf1093/wugaduzotibupukokoviwanem.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2e029870-44a9-44c1-b775-e8eb1dd24b8b/jotaxaminirajivajosero.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2afc80c2-71d9-4843-ba5c-caab823c9768/jejugumenu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/47a4cf2e-ecd4-44fe-bd54-673d7dc8f6f8/8560423369.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6d2c8f5b-f066-4939-a1c7-e5956e9308df/zidelapudabejavapiro.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00008160.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8160	5356 bytes
SHA-256: `e771be75c0b2467d2f38a24e564380e164fb8643ce3cb851b10d84023015a06b`
`font_01_sfnt_off00009365.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9365	1800 bytes
SHA-256: `e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d`
`font_02_sfnt_off00009bf3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9BF3	11428 bytes
SHA-256: `75d27e46a90b62ff8af29bbb8be3ecbc2ce3190dff77b7d37346003d2c3ff9a0`

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