Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bd90460e96a486…

MALICIOUS

PDF

80.1 KB Created: 2021-04-22 04:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8cc9cf0c9d09c49295eaa7e80fc62c5e SHA-1: ae0183cfa56fffb64dc74f69000f09366f58de6c SHA-256: f3bd90460e96a486a78c97a8570af58015db1e43aee02bf4a8a9b64f0c48df09
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or are part of a link farm. One of the URLs, 'https://yafferge.ru/strik?utm_term=wd+tv+media+player+manual', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its purported content, but the link farm behavior is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=wd+tv+media+player+manual In PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/dudikepifib_maxiko.pdfIn PDF document text
    • https://wiguvizokon.weebly.com/uploads/1/3/0/7/130776253/6219876.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/8ae504518f4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvubojetixag.epizy.com/medefosekezewuxarizum.pdfIn PDF document text
    • https://3557a179-a1ee-4801-a209-85ad6f504536.filesusr.com/ugd/9c409a_2a717c8bffc24310ae6500a62294e15d.pdf?index=trueIn PDF document text
    • http://bumosutu.rf.gd/how_to_update_fiio_x1_2nd_gen_firmware.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_7de8343f927a44df8d29455db43b6246.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_0dc73f81d58245899bb340e967151e68.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_56be614a6d0c43c2b99f8375c4faa467.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_c664fe726c7142a9813f48beb676149a.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_27827e12965f4d99ac9d2a267396c8c6.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_1a039e5c1f7f4668abafb633a0e71799.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_953213cf8a0747459fe4199c2203d2aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a444e5ef-3ef7-4b90-89f6-eea1b2b95f5a/75082099884.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_881551a1e4bf4bd48c225d5ac4640b80.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_22913f720b1e4224a885cfeb4e95cccb.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_1c9057f41b0045279a05db0833c3604a.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_1027bd47b7b14053ae19415ff6eb8219.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_9741c93fc4a941d7b52d19b025e0c4f4.pdf?index=trueIn PDF document text
    • http://muwodedera.epizy.com/40140182657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a84ba81-6aa2-43c3-af56-c597e95c67f0/free_download_autocad_blocks_interior_design.pdfIn PDF document text
    • http://jezutax.rf.gd/economic_systems_quiz_answer_key.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_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 5104 bytes
SHA-256: ab093ee2f9046fc52ca52bce162c9a2c3993b23cc413e9e44aa5eb2df4597191
font_01_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 10648 bytes
SHA-256: 84e4b9b9303e6e55f75cec0b5d04602d55a4cd21942e9beecace97042db9184c

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